"Yes, sir," replied the subordinate, stepping up to the king and

saluting smartly.

"Take it away to leeward there, and show this dull Englishman how he may

learn chemistry and science even from inhabitants of the Hamadian

Desert. Here, take this, you will need it," and the chief handed to his

assistant a small cylindrical tube with which to carry out his orders.

Turning next to the Englishman, he observed, "Know, you dullard, that a

small admixture of a secret gas, which is known only to three living

men, will make your renowned helium flare like hydrogen. You shall see

it in a short space of time."

"Recall your man, I will take your word for it, Sultan!" exclaimed the

captain, who now felt that it must be so, for he was already bewildered

by the strange things which he had witnessed that day, and he had no

desire to see this experiment carried out.

"You believe me, then," returned the air-king, who seemed particularly

to relish this interview with the Englishman, especially with this group

of celebrities within earshot, for they had listened eagerly to every

word which he had spoken. And the German knew that though his days

might be numbered, as indeed he felt they were, yet his fame would be

greatly enhanced by the episodes of this day, for vanity was not the

least among his failings.

Once more he glanced at his watch; for the allotted space of time had

nearly run.

"How now, Englishman!" he exclaimed in a harsher tone. "The bill of

lading, where is it?"

The chief purser, receiving the captain's nod, at once advanced towards

the regal horseman, handed him a bundle of papers and said: "Here, sir,

is the document you desire."

*CHAPTER XII*

*THE MAHARAJAH'S CHOICE*

A dramatic episode followed the examination of the airship's bill of

lading by the _pseudo_ monarch and his so-called chancellor of the

exchequer, Carl, who aided his master in the task.

"Item one. What does that consist of?" asked the brigand.

"Mails. His Britannic Majesty's mails," replied the chancellor.

"Where from?"

"From India for Egypt and London," replied Carl, maintaining a grave and

solemn deportment.

"H'm! They may pass when the usual tribute is paid," remarked the

bandit in serious tones, as though he had delivered himself of some

weighty pronouncement.

The judge looked at the colonel with raised eyebrows when he heard this

strange decision, but the captain, forgetting his position for a moment,

blurted out:--

"Tribute indeed? When did the King of England pay tribute for his mails

to be carried across the Hamadian desert?"

The air-king eyed the speaker with apparent amazement, mingled with a

touch of scorn and pity, then quietly observed:--

"That is the very point, Captain. There has been far too much laxity in

this respect in the past. The liberties of the small nations to make

their own laws, and possess their own lands in peace, have been greatly

endangered of late. It is mere brigandage for a great power to

over-ride the native interests of small communities. But from to-day

this brigandage must cease, at any rate over the territories where I

rule."

The captain could find no reply to this sally of the desert king's, and,

while a smile played about the corners of his mouth, he looked beyond

this robber chief, in his gaudy trappings, to where the _Scorpion_ lay

squatting like an ugly toad upon the sands.

At length the monarch resumed his cross-examination with these words:

"Come, Captain, will you pay tribute for the transit of mails across my

territory, or will you not?"

"I will not!" replied the skipper.

With a flash of fire in his tones the brigand ordered: "Take the first

ten sacks of mails out into the desert and burn them at once."

"It shall be done, O chief," replied Max, who immediately detailed some

of the natives to carry the order into effect, when the captain, urged

to it by the judge, asked:--

"What is the amount of the tribute?"

"Ten thousand pounds in English gold," came the immediate reply.

"I cannot pay it," returned the captain. "It is mere plunder," though

the judge pointed out to the commander quietly that it would probably be

more profitable to pay it and to get away with the mails in a damaged

airship, than to leave the mails behind to be lost or destroyed in the

desert.

"He will take the gold anyhow, when he comes to it on the bill of

lading," added the colonel, "though devil a penny I'd pay him."

"It isn't my money," argued the captain, "so there's an end of it."

"How now, Englishmen! We are wasting time. Will you pay the sum

demanded?"

"No, I will not!"

"Very good. Get out the rest of the mails and burn them at once!"

ordered the monarch, and a couple of minutes afterwards the first bags

of mails, sprayed with some inflammatory liquid, were blazing furiously.

"Item two!" called the desert king.

"Gold. Nineteen boxes of bullion for the Bank of England," called out

the chancellor.

"Gold?" echoed the air-fiend, as though he were utterly unconscious of

the presence of such a commodity, in face of the captain's refusal to

pay over a trifling ten thousand pounds to secure right of way for his

mails.

"Yes, sir. Nearly one hundred thousand pounds in specie."

"I thought we had prohibited the importation of gold into these regions,

chancellor, because of its evil effects upon the minds of the people."

"Yes, sir," returned the chancellor. "We decided to abolish its

importation altogether on that account, save only as tribute money for

the royal chest."

"Exactly," replied the bandit, in a tone of assumed moral injury. Then,

turning to the Englishman, he said: "You must know, Captain, that most

wars are caused by gold, and by the unbrotherly strife which it foments.

You must know also that all wars are sustained by it."

"Yes, I agree with you for once," returned the prisoner, boldly,

wondering at the ease with which this confirmed brigand could turn

moralist.

"Then what must be done with the gold, sir?" asked the chancellor.

"Every ounce of gold on the airship must be confiscated," exclaimed the

king of robbers as he uplifted his hands in pious horror. "Let it be

removed at once."

"Very well, sir," and this second operation, which was more pleasing

still to the waiting Arabs, was immediately put into effect.

"Item three!" called out the chief.

"Ten boxes of valuables, including the personal property and belongings

of one of the passengers," came the reply.

"What, do they belong to one person?"

"Yes, sir."

"What is his name?"

"The Maharajah of Bangapore, sir," returned the wise man of the

exchequer, whose task promised to be an easy one in the future, judging

by the vast amount of spoil which had already fallen into his lap.

"The Maharajah of Bangapore?" repeated the monarch, raising his hand to

his forehead for an instant, as though he would recall some long

forgotten episode. "Is he amongst the company present?"

"I believe so."

"Ask him to stand forth."

And the Indian prince, hearing his name called in English, stepped forth

and confronted his old enemy of the Mesopotamian campaign. When their

eyes met a flash of fire, more eloquent than words, revealed what was in

each man's mind. The prince expected to be tortured to death and was

prepared for it, for, like all his people, he was brave as well as

fierce. At last the robber spoke.

"Prince Jaipur, you are an enemy of mine," he said.

"I know it!"

"Do you expect mercy after the way your tribesmen massacred my men at

Kerbela?"

The maharajah shrugged his shoulders, but disdained to reply to this

upstart robber chief who styled himself a king.

"Do you know that your life is in my hands?" exclaimed the bandit

fiercely.

"I am not afraid of anything you can do, brigand!" hissed the prince,

and his voice sounded not unlike the angry, venomous snake in the

jungle. Another man might have quailed before those glaring eyes and

those hissing tones. But the German quavered not.

"I will give you a kingly choice," he said, "as you are the scion of

half a hundred kings in your illustrious line."

"I ask no favours of a common Bedouin robber," snarled the other.

"Listen. I will give you the choice of drinking this deadly poison, or

of being dropped ten thousand feet from my aeroplane. Which will you

take?"

The prince shuddered slightly, and glanced up into the cloudless blue,

as though anticipating what such a death might mean, then looked at the

small phial which the brigand held forth in his hand.

"Yes, ten thousand feet!" continued the German, as he noted the anxious

look which overcast the Hindoo's face for an instant, as he gazed up

into the sky. "Then I will loop the machine, and, with your hands

pinioned, you will be thrown out and drop, drop---- Which will you

choose?"

"I will drink the poison," replied the prince, who had now regained his

usual composure.

"Very well. Let him be securely tied to that tree to await our

pleasure," and the maharajah was instantly seized by three or four

powerful Arabs, and secured to a tree some twenty paces away.

"What about his valuables, sir?" asked Carl.

"Have you examined them?"

"Yes, sir."

"And what do they consist of?" asked the king.

"His jewels, his gold and silver plate, studded with rare gems of

priceless value. They are worth five times the value of the specie,"

whispered Carl.

"And what else? You said there were ten boxes."

"Part of his regalia and numerous ceremonial robes."

"They are all confiscated!" announced the monarch. "The sun will set in

another two hours, and at sunset the Indian must die."

"There is nothing else, sir, of much value. All the gold and this

personal property has been secured. Here is the list of passengers, for

there are scarcely any passports held by the strangers," and here Carl,

who had paid a visit to the aerial, whispered something to his chief.

"Good! Then, in your opinion, chancellor, sufficient tribute has now

been obtained from these strangers who have crossed our territory

without permission," said the bandit aloud for all to hear.

"Yes, sir."

"Then let them board the airship at once. She will be cast adrift in ten

minutes."

At this there was a scramble for the gondolas, and very quickly all,

save the captain and the navigating officer, were aboard. The judge and

the colonel, however, prevailed upon by the maharajah's men, descended

again to intercede for the life of the Indian.

"You have taken the man's jewels," said the colonel. "At least you

might spare his life."

"You may have his body," remarked the airman, "but he must first drink

the phial," and a stern look appeared once more in the robber-bandit's

eyes. On this point he was unbending, and remained like adamant.

"The airship is ready now, sir," said the captain, making a final appeal

for the life of the maharajah. "I should like to report, at any rate,

when I do complete my journey, that all my passengers are safe, though I

expect to be two days late with only two engines and this beam wind.

Once more, will you release the Indian?"

"Bring him before me!" commanded the monarch at last, with a bored

expression, and the Indian, still bound hand and foot, was brought

before the pseudo king.

"Unloose his hands," came the order.

"They ask me to spare your life, Indian dog!" continued the robber,

addressing the prince in contemptuous tones. "If you sue for it

yourself, you may have it, otherwise..." and, instead of completing his

sentence, the speaker shook the little phial in the face of the

prisoner.

"I will not ask my life of you, serpent!" hissed the captive. "From you

I will accept no favours. Robbed of my family heirlooms, my jewels and

my household gods, I prefer to die. Give me the poison, and I will show

you how a real prince of the royal line of Indus can die!"

For one awful instant, the desert chief glared at his enemy, who had

dared to refuse his generous offer. Then, in angry tones, he cried:--

"Indian dog! I offered you mercy, but you spurn the gift of Allah and

ask for death. Then take this and drink it!" and he tossed him the

phial.

"Stay!" cried half a dozen voices from amongst the group of passengers.

But their expostulations were in vain, for, with an eagerness to hide

his disgrace in death, which only a proud oriental can show, the

prisoner caught the phial, withdrew the small cork, and drained the

contents before his horrified friends could interfere.

The next moment, the body of the maharajah lay prostrate upon the sands

of the Hamadian desert.

*CHAPTER XIII*

*THE MISSING AIRSHIP*

Horrified and aghast at the foul deed which had been done, the

passengers and crew of the air-liner, who had left the gondolas at the

cry of consternation which went up, now crowded around the fallen

prince. Even those fierce sons of the desert who witnessed the dire act

could not restrain an involuntary shudder, but they merely shrugged

their shoulders, or remarked: "Kismet! It is the will of Allah, the

Compassionate, the Merciful," and after some such invocation, their

piety appeared to be satisfied, for they immediately returned to their

treasure.

The captain and his friends were loud in their protestations and

imprecations after their first and futile attempts to rouse the

prostrate man, for they believed him to be already dead. They glared at

the pseudo caliph, who appeared to be entirely unmoved by the

heart-rending spectacle. And if, at that moment, any weapon of offence

had remained in their possession, it would certainly have been turned

upon the offender, whom they now regarded as a murderer.

But every weapon had been carefully removed from the air-liner and her

complement; even the unmounted machine-gun and the one box of ammunition

placed aboard on her first voyage, were now in possession of the

bandits.

The captain in particular was furious, and he turned upon the German

fiercely, shook his fist at him and cried, "One day you will pay for

this, sirrah! The arm of Britain is long enough to reach you!"

A mocking laugh was the only reply which the German gave. Then, looking

once more at his jewelled watch, he signified that the time for the

airship's departure had almost arrived.

"Three minutes more and I shall cut her adrift," he said.

"But the maharajah?" asked the captain. "What can we do with him; we

cannot leave his body to the vultures."

"Bah! Take him away with you. He will live again in seven hours; it

was only morphine!"

Bewildered, but yet relieved by these words, they quickly ascertained

that the prostrate man was not actually dead, and they hurriedly placed

him aboard the airship and administered emetics.

"Let us get him away at once," urged the Indian judge; "perhaps the

higher altitudes will quickly dissipate the effects of the morphine."

"Are you ready there?" shouted the caliph, who had ridden with his

escort up to the central gondola.

"Yes," came the response.

"Then remember, the next time that you invade my dominions without my

permission you will not escape so easily. As you know to your cost, the

King of the Hamadian desert is able to defend himself and his people,

even from the insults of a great power."

The captain made a slight bow, half ironical, in response to this kingly

assertion, and asked,

"Is there any communication which your majesty would like to have

delivered to my Government?"

"Yes," replied the monarch, drawing from under his loose robe a sealed

packet, which he appeared to have had in readiness for the occasion. It

was addressed as follows:--

"To Colonel John Tempest, D.S.O., M.C..

Chief Commissioner of the British Aerial

Police, Scotland Yard, London,"

and across the top left-hand corner it was marked "_Confidential_," and

also "_To be delivered personally by the Captain of the Air-Liner,

Empress of Britain_."

The skipper, apparently bewildered for a moment by this strange request,

for it seemed to him like a letter from a condemned man to his

executioner, looked the packet over for a few seconds. Noting the great

red seal on the back, he read the imprint embossed on the huge wafer.

It read as follows, and was circular in form:--

"From Sultan von Selim, Air-King of the Hamadian desert," and the crest

was a scorpion, with the solitary word in Latin, "_Scorpio_."

The caliph waited patiently until the captain had examined the exterior

of the packet, and recovered from his amazement, and then said, "Before

you depart, Captain, you must promise me that you will deliver that

packet in person to Colonel Tempest, who is not unknown to me."

The captain did not answer for a few seconds, for he was wondering what

new conspiracy was this. He was wondering also whether the conveyance

of this packet was not after all the real reason for the forced descent

of the airship.

"Do you promise, Captain?" asked his interrogator, looking at him

fixedly.

"Yes, I promise."

"On your honour?"

"On my word of honour, I promise to deliver it."

"Then good-bye. I will 'wireless' the patrols to look out for you."

"Thank you," replied the skipper acidly.

And the next moment, seeing that only his own accomplices and reputed

subjects were left on the ground, the Sultan gave the order, "Let go!"

So the huge cable was slipped, and the leviathan left her moorings at

once. The north-west wind carried her clear of the trees, and, as she

had left nearly two tons of her most precious cargo behind, she rose

rapidly, then started falteringly on her long journey to Cairo as her

two remaining Sunbeam-Maori engines burst into life.

The sun, which had shone with pitiless might upon the Arabian desert

that day, was sinking like a huge red ball beneath the horizon when the

great air-liner, drifting considerably from her course, but still making

progress in her journey towards Cairo, disappeared from the watchers'

view.

With strange impartiality, inexplicable in such a robber-bandit, the

spoil had been divided amongst the Bedouins, who, to their bewilderment

and surprise, were now rich, each one of them, beyond the dreams of

avarice. Their gratitude to Allah, the Giver of all Good, and to the

great white sheik was unbounded. Never before had their greedy eyes

beheld such treasure; never before had they gained a prize so easily;

and some of them even wondered whether, after all, Mohammed had not

appeared to the Faithful once more in the person of the great white

sheik.

Long before midnight, however, the last man, with heavily-laden beast of

burden, had disappeared, swallowed up, as it were, by the very sands of

the desert, so that, when the full round moon approached the meridian

and changed the gold of the desert to silver, not a vestige of man or

beast remained. And of the camp, only a few ashes marked the spot where

once a fire had burned. The _Scorpion_, too, had taken its departure

for an unknown destination, carrying its mysterious crew far, far away

from these burning sands, for the indomitable commander knew only too

well that the captain spoke truthfully when he said that the arm of

Britain was very long, and could even reach to this wild desert land.

Before his departure, however, Heinrich von Spitzer had sent off his

promised message in laconic terms to the Cairo patrols. It ran as

follows:--

"Air-liner _Empress_ with damaged engines crossing desert towards Cairo.

Lat. 29-50 N., Long. 40-25 E. drifting W.S.W. Wireless deranged.

SCORPIO."

"Piece of bad luck, sir!" remarked the commissioner's assistant at Cairo

when he received the message.

"H'm! She carries the Indian mail, too," replied his chief.

"Yes, and a good deal more, sir."

"What else does she carry this trip besides passengers and mails?" asked

the alert commissioner.

"That big loading of specie, sir, for the Bank of England. Nearly a ton

of gold, I believe."

"Phew! And isn't the maharajah of somewhere or other coming on a state

visit to the King also?"

"Yes, by Jove, so he is! We had a message this morning saying that he

would travel by the _Empress_."

"Heaven help us if she comes down in the desert with that cargo. The

Bedouins would soon make short work of it. The authorities rely too

much upon the patrols for these long journeys," said the commissioner.

"We were asked to take particular care over her this trip. The Delhi

patrols accompanied her part of the way, and she was all right up to

mid-day, but she hasn't spoken to us since. I have sent out one or two

messages and have had the patrols ready to go out and meet her, as soon

as I heard again from her, giving her position, sir."

"And you've had no further reply till this message came in?" asked the

chief.

"No, sir."

"By the way, is her wireless damaged as well as her engine? I didn't

notice."

"Yes, sir. The message says: 'Wireless deranged,'" replied the

assistant, re-reading from the aerogram.

"Then who the deuce sent the message?"

"Scorpio---- But who Scorpio is I can't make out. It must have been

some passing airman, for it cannot have been one of our own patrols."

"Phew! The mystery deepens. Get the patrols out at once, and tell them

to take plenty of ammunition with them. It will take a few rounds to

scare off those Bedouin fiends if once they get round a carcase where

there are such pickings."

"I don't think there's much to worry about in that respect. Those Arabs

have a wholesome fear of these air-liners, sir. However, I will get the

machines off at once."

*CHAPTER XIV*

*BETRAYED BY THE CAMERA*

The order was quickly given for the aerial police scouts to start.

Within a few minutes the patrols left Cairo and the adjoining

air-stations, and, spreading out fan-wise, they crossed the Canal, the

Gulf of Sinai, the wild mountainous peninsula which bears the same name,

and the Hedjaz coast, until they entered the desert regions beyond.

Then they commenced their search by moonlight for the battered and

drifting air-liner over the trackless, desert lands which lie between

the 28th and the 30th parallels.

By a pre-arranged system of Very lights, the patrols kept each other

informed of their exact positions during the night, and watched keenly

the eastern horizon for any response which might come from the belated

airship.

Meanwhile the air-liner, fighting manfully against the freshening wind,

made very slow progress, and drifted still further and further away from

her course. The air was full of wireless messages both from Cairo and

the patrols, but she was as yet unable to reply and define her position.

The engineer and wireless operator, however, had been able to receive

some of the messages indistinctly, and they knew at any rate that help

was not far away.

The captain was naturally very much depressed by the turn of events.

Somehow he felt that he had not acted very heroically in the matter. He

had considered the safety of his distinguished passengers perhaps too

much.

"If I had had no passengers to consider, I would have remained aloft

until the whole liner had been shot to ribbons!" he declared to himself,

when he at last retired for a few minutes to his private cabin. "They

should never have taken me alive! But there, my instructions stand--the

safety of the passengers and crew before anything else. I was a fool,

though, to act as I did. I ought to have sent out the S.O.S. to Cairo

without a second's delay, instead of arguing with this brigand; but

there, whoever expected to encounter anything like this?"

Then as his thoughts turned to the wonderful machine, he endeavoured to

docket all the information he could remember about the brigand's

aeroplane, for he knew that he would be expected to recount every detail

when he met the court of enquiry, "which," he murmured, "is as certain

to take place as to-morrow's sunrise.

"Gee whiz! Three hundred miles an hour, and silent engines to boot!

Phew! nobody will believe me, anyhow. Still, I shall have to face the

music, and also to explain why I have lost a hundred thousand pounds of

specie," and the skipper looked down on the white sands below, and for a

moment he almost contemplated suicide.

"I wouldn't mind if I could only bring sufficient information to the

authorities to lead to the speedy capture of the villain, but I can't.

There wasn't time even for a photograph. The bandit was aware of all

that, and I understand that every camera was removed from the airship

before he let us go."

At that instant there came a slight tap at the cabin door.

"Come in!" cried the commander, expecting some further report from the

sick-berth steward about the condition of the maharajah, who, half an

hour ago, was said to be showing signs of recovery, owing to the bracing

air at three thousand feet.

The door opened, and Gadget, the ship's mascot, appeared. Now Gadget's

newest hobby was photography, and through the kindness of the

photographic officer he had become the proud possessor of a small pocket

camera.

"I got her, sir! Thought you'd like to see her ... begging your

pardon," and Gadget, with his dirty, but sunny, smiling face stopped

short and pulled his lock of hair by way of salute, as the captain

pulled him up sharply by snapping out:--

"Got whom? Like to see whom, Gadget?"

"The 'Clutchin' Hand,' sir," explained Gadget, who now found himself

floored for once by his want of English.

"I don't understand, boy?"

"The bloke what played the dirty on us, sir," replied the boy, opening

wide his bright blue eyes, and holding out three wet and recently

developed pocket films.

"Him what got the swag, sir," continued the urchin, endeavouring to make

himself clear.

"Oh, you mean that you photographed the brigand!" replied the skipper as

he caught sight of the negatives, and snatched at them eagerly, a new

light coming into his eyes.

"Yessir!" exclaimed the lad. "Him what said he was a King of the

Desert."

"Gadget!" exclaimed the captain, after a brief examination of the films,

which were really three fine, clearly defined pictures of the

_Scorpion_, showing her in mid-air, when alongside the _Empress_.

"Yessir," replied the excited youth, not yet certain whether he was

going to be hanged or praised for his offence.

"You have shown more wit and skill than anyone on board the airship.

You shall be well rewarded for this, I promise you. How on earth you

managed to get three good snapshots like these, all showing different

angles of the machine, and to hide them away, is beyond me!"

"Thank you, sir! Thought you'd like 'em," and the boy's eyes sparkled

even more than ever as the captain shook him by the hand, and planted

five new, crisp Bradburys therein, then dismissed him.

"Great Scott!" exclaimed the captain, "but that little urchin's saved my

reputation. These photographs may prove of more value to the authorities

than the lost treasure. I feel a different man. Here is extraordinary

evidence against the culprit. One photograph shows the fiend actually

firing a burst at the twin engines in the rear gondola, and another the

faces of the two occupants above the fuselage. They will show more

evidence still when they have been enlarged." And the captain, after

carefully drying them, placed them in an envelope and put them into his

inner coat pocket, muttering:--

"Smart little beggar! I wish I hadn't punished him the other day for

smuggling that tobacco aboard."

The captain, who had left strict instructions that he should be called

half an hour before the end of the watch, in order that he might relieve

the navigating officer, was just about to lie down on the couch for a

brief spell, when suddenly another knock at his cabin door startled him,

and immediately after his servant entered and announced: "Seven bells,

sir."

"Already?" exclaimed the captain.

"Yes, sir."

"Has the moon set, yet?"

"Yes, it is quite dark now, sir."

"All right. Tell the navigating officer that I'll be down in one

moment."

At this very instant the telephone bell which connected the cabin with

the navigating gondola rang furiously. Snatching up the receiver, the

captain asked, "What's the matter, Donaldson? Is there another raider

on the starboard bow?"

"No, sir, but there's something very much like a signal flash away in

the north-west."

"Sure it wasn't a shooting star?"

"More like a Very light, sir, but very faint," replied the navigating

officer. "Shall I reply, sir?"

"Yes, give him three red lights. I expect it's one of the patrols

looking for us. I'm coming down now," and the captain replaced the

receiver, and made haste down the corridor which led to the chart and

navigation room.

The next instant three red balls of fire fell from the airship

earthwards in rapid succession, and within a couple of minutes a faint

gleam of greenish light fell like an arc in the north-western sky.

"Yes, the patrols have found us, sure enough," exclaimed the captain,

who had now joined the officer.

After several further exchanges of fire-balls, repeated now from two or

three quarters, the searchers closed in upon the straggler. Then a

rapid dialogue took place by means of the morse lamp, and, when dawn

came, shortly afterwards, no less than six fighting scouts, running at

about a quarter throttle, surrounded the wounded leviathan, and escorted

her towards Cairo.

When the _Empress_ reached that town, she was already twenty-four hours

overdue at London, so the cables and the wireless stations were busy

with messages relating to the missing liner, and with more than one

inquiry as to the safety of her cargo, evidently from the consignees, or

more likely still, from the underwriters.

And when the captain told his story to the Commissioner of Aerial Police

at Cairo there was another mighty stir, and both the cables and the

wireless were busy again, for the whole civilized world was tingling

with excitement to know something tangible about this man of

mystery--the phantom airman. And the story of Gadget's photographs was

told to the world.

*CHAPTER XV*

*DIAMOND CUT DIAMOND*

While the events recorded in the last few chapters were taking place, a

series of adventures not less exciting and perilous had befallen the two

airmen, Keane and Sharpe, in their endeavours to track that ingenious

conspirator, Professor Rudolf Weissmann, in his secret retreat within

the dark recesses of the Schwarzwald.

After their midnight consultation with Colonel Tempest at Scotland Yard,

their instructions were to proceed early next day, by whatever aircraft

was then available, to Germany, and once there to adopt some suitable

disguise, and institute forthwith a most rigorous search for the secret

aerodrome. They were to leave no stone unturned in their efforts to

track down this great German irreconcilable, who had dared to hold a

pistol at the civilized world, and to bring back, if possible, some

tangible clue concerning his two great discoveries.

"Time is short," the colonel said. "Immediate action on our part is

vital. Spare no expense in the venture, and if necessary you must even

proceed to extreme measures to capture this daring outlaw and his

accomplices."

"And what about this phantom aeroplane?" asked Keane. "Apparently it

has already left the Schwarzwald on its piratical expedition."

"It may return, and you must watch for it. Some of those scattered

inhabitants of the Black Forest are sure to have seen or heard something

of it. Its trial trips must have been carried out somewhere in the

vicinity."

"They are a simple and primitive type of people who still inhabit those

forest wastes; wood cutters, lumbermen, makers of little wooden clocks

and musical boxes, most of them, I believe," added Sharpe, who had often

traversed those regions as a British spy during the Great War.

"Then they should be easier to handle," added the commissioner of aerial

police, who had a ready method of brushing away apparent difficulties.

"I am compelled to rely almost entirely upon your efforts. Take your

pocket-wireless telephones with you and a sufficient quantity of German

gold and silver, and start directly you have had a few hours' rest."

"We will get away immediately after breakfast, sir," replied Keane, who

had already made up his mind as to how he should proceed in the matter,

for he had fixed up his jumping-off ground for the Schwarzwald, and also

the type of disguise he intended to adopt.

"Good-bye, both of you, and may good fortune attend you!" said the

colonel.

"Good-bye, sir."

Big Ben was striking three o'clock as they left Scotland Yard and made

for their quarters, which were in that part of London known as The

Adelphi, a quaint, old-fashioned ensemble of buildings of the Georgian

period, overlooking the Thames, not far from the Watergate. A few

minutes later they bade each other good-night, and turned in for a few

hours' sleep before their long flight across England and France.

At seven o'clock they were breakfasting together in a private room

overlooking the river, and discussing the details of their coming

adventure.

"The Schwarzwald!" Sharpe was saying, as he helped himself to another

egg and a rasher of ham. "Where do you think, now, we had better start

from, Captain Keane?"

"Mulhausen," replied the other promptly, for with Keane the initial

procedure was already cut and dried.

"Mulhausen? Capital! I was thinking of Strasburg, but your idea is

better still. Is there a good aerodrome there where we can land?"

"Yes, on the banks of the little river Ill, which runs into the Rhine a

little lower down. And once across the Rhine we are already in the Black

Forest, though we shall still have a long tramp to the place which I

suspect," added Keane, pouring out another cup of coffee.

"Oh, yes, I remember the place; the aerodrome is near the junction of

the Rhine-Rhone Canal," replied his companion.

"You've got it, exactly. Now we must get away; it must already be seven

o'clock, and a fine morning to boot. What says the weather report about

the Channel crossing?"

"Here it is," exclaimed Sharpe, passing a copy of the _Times_ across to

his friend, who turned over the pages and read as follows:--

"Flying prospects for to-day:--South-east England and Continent,

including the Channel crossing, favourable for flying for all types of

machines till mid-day, after that conditions will deteriorate, squalls

and heavy rains will predominate, visibility will be poor, and

conditions will become unsuitable for cross-country flying."

"Good! Then we must get away at once," observed Sharpe, and within

another five minutes they were being hurled along towards Hounslow, the

aerodrome from which this new adventure was to begin.

Forty-five minutes later a couple of S.E.9s, the fastest machines in the

service, rose from the flying ground and steered a course

east-south-east for the Straits of Dover. Thirty-five minutes later,

the necessary signals having been accepted by the Dover patrols, with

throttles wide open, the two daring young aviators rushed the Channel at

one hundred and fifty miles an hour.

The French patrols having been informed by Dover, permitted them to pass

unchallenged. And now changing course till they steered almost due

south-east, they sped onwards, catching now and again a glimpse of the

old battle-front of the days of 1914-1918, where the shell-marked

craters of the Hindenberg line were still visible from the air.

Then they followed the railway line from Laon to Rheims, left the

ancient town of Nancy to their left, and, crossing the Vosges Mountains

and forests a little to the north of Belfort, they dropped down quietly

to the landing ground outside Mulhausen in Alsace, as the clock in the

Market Square struck the hour of noon.

Having left their machines and flying gear in charge of the commandant,

they entered the town, purchased a portable camp outfit, and, dressed as

tourists of the pedestrian and naturalist type, continued their journey,

crossed the Rhine and entered the Schwarzwald, ostensibly to study the

fauna and flora of the Black Forest.

"Phew! I'm tired of this load. Let us camp here for the night, by this

little clearing, where these seldom trodden footpaths diverge," said

Keane, some hours later, as, weary and dusty with his three hours' tramp

through the bracken and the tousled undergrowth, he threw down his heavy

knapsack and nets, and began to wipe the perspiration from his forehead.

Then they lit a small fire of dried twigs, cooked their evening meal,

and lit their pipes.

After a quiet smoke, during which time they carefully re-examined a

survey map of the Schwarzwald, they began to talk in low whispers,

whilst the sun descended amongst the pines on the western heights, over

which they had dragged their weary feet.

"It is my opinion," whispered Keane, "that we are within five miles of

that secret aerodrome."

His companion nodded, almost drowsily, although every faculty was kept

constantly alert.

"It is just possible that one of these paths leads to the very spot, but

it will be necessary to explore them both. We must be extremely

careful, however, for this professor is sure to prove a wily opponent.

I hope, however, some wood-cutter or peasant may pass this way soon, and

that we may learn something from him which will help us," continued the

senior airman.

"What if the wood-cutter should prove to be the professor himself?"

asked Sharpe, with a humorous twinkle in his eyes.

"It is even possible," returned his companion.

"In that case it would be diamond cut diamond, Keane, eh?"

The other shrugged his shoulder at the very thought, and prayed that

such a contingency might not happen, at any rate until something

tangible had first been discovered.

"In three hours it will be midnight," he said. "If no one passes this

way by then, I think we must carry out our search in the dark. Time is

pressing; we must find something within another forty-eight hours, or

poor old Tempest will be at his wit's end, and calling us home again.

He cannot leave us long on this trail."

"The greater the pity. A fortnight is not too long to follow a trail

like this," said Sharpe.

"Yet you had to do things pretty smartly in those dark days of 1917 and

1918, Sharpe."

"Yes, and there was some danger and excitement attached to it, which

sharpened one's wits."

"Never fear! There'll be both before we have finished this trek,"

returned Keane.

"Hist! What was that?" said Sharpe in an undertone, as he caught the

sound of broken twigs.

"Someone approaching," whispered his companion.

They listened acutely now, with every sense keenly alert. Again they

heard the sound, and it seemed to come from the western side of the open

glade, where the last dull glow of the sunset still revealed the edge of

the forest.

The camp fire had died down to a smoulder, but Keane instinctively held

his ground sheet before the dying embers, lest their presence should be

betrayed. He was anxious to learn something of the nature of this

visitor before he revealed himself.

"Bah! It is some creature of the forest," observed Sharpe, after a

moment's hesitation. "A wild boar or a red-spotted deer, most likely."

He was right, for the next moment a series of grunts proceeded from the

spot whence came the sounds, and, as though suddenly startled by the

consciousness of some human presence, the beast, a fine specimen of the

_Sus Scrofa_, with fierce protruding tusks and long stiff bristles,

broke cover, trotted swiftly across the glade, within thirty yards of

the two watchers, and entered the forest on the other side.

"So much for that little incident," muttered Sharpe, as he released his

grip of the Webley pistol, which his right hand had instinctively

grasped, when the dark shadow broke from the margin of the trees.

Keane shook his head as though he disagreed with his companion, and

remarked in a low voice, "The creature was evidently startled or it

would not have fled like that. Its scent is very keen, and as the wind

is blowing from the west, it suspected danger from that quarter."

*CHAPTER XVI*

*THE GHOSTLY VISITANT*

A few moments later the two men were startled by the sound of a human

voice, trolling out the words of some German folk-song, and approaching

from the same quarter towards the clearing.

"This is our man," exclaimed Keane, as he removed the screen from the

fire and stirred the dying embers into a cheerful blaze, piling on more

dried twigs, so that the trees about the glade seemed to dance like

fairies.

"Some woodman or peasant returning from a party," observed Sharpe.

"I wonder where his cottage is," replied his friend; "it must be

somewhere in the neighbourhood."

"We must welcome him to a belated supper. Perhaps this good Rhine wine

will open his lips still more, and he may tell us something about the

birds of the Schwarzwald."

"Particularly the phantom-bird," facetiously observed Keane with a

smile.

Nearer and nearer came the stranger, breaking occasionally into snatches

of song, as though he would frighten away the goblins and weird

creatures of the forest, for of the superstitious peoples of Europe, the

peasantry of the Black Forest are most given to credulous beliefs.

Perhaps this is because no other district of Europe is so rich in quaint

legend, folklore and ghostly tradition.

Now and then the approaching stranger would stop his singing to address

some remark to a companion; evidently some beast of burden trudging

beside him. The next moment the figure of a man, leading a pack-horse

through the forest, suddenly emerged upon the clearing. Catching a

sight of the dancing flames which mounted skyward as one of the airmen

stirred the fire into life, and beholding the dark figures of the two

strangers, the newcomer, suddenly stopped, apparently half-terrified by

the sudden apparition.

"Geistlich!" he muttered, staring with wide-open eyes towards the sudden

flame.

"Guten abend, freund!" exclaimed Keane, wishing to draw the man into

conversation.

The man's fears departed as soon as he discovered that he was addressed

by human beings like himself, for in his first wild flight of fancy he

feared it was far otherwise, and that he had suddenly come upon one of

those forbidden glades, where the sprites and goblins dance after dark.

"Guten abend!" he replied, and, being asked to join the company, made

haste to do so, reining in his loaded horse and tethering him to a

tree-stump close by.

"'Tis late to travel these lonely woods, friend," said Keane in

excellent German.

"Yes, 'tis late, but the moon will soon be up, and then, why, 'twill be

better footing," replied the stranger, whose full, round face and

longing eyes were already directed towards a wicker-covered bottle,

which seemed to hold something good, so that he smacked his lips once or

twice, and in fancy he was already draining the sweet nectar which the

bottle contained.

"Have you far to go?" asked Sharpe.

"Why, yes, 'tis another seven miles to my cottage in the woods."

"Then stay with us an hour until the moon shall rise and clear away the

goblins of the Schwarzwald," urged Keane, who, by this time, had been

able to examine the stranger's face by the light of the fire, and to

read it like a book.

"A simple, credulous fellow, a true peasant of the Schwarzwald,

untouched by the outer world," he told himself. "He should be useful to

us." Then, passing to him the wicker-covered bottle, he said:--

"Good Rhine wine from Bacharach, Hans. Taste it!"

"Ach, from Bacharach on the Rhine,

Comes the finest sort of wine,"

exclaimed the stranger in the rude dialect of the Black Forest, and his

round eyes sparkled as he clutched the bottle, raised it to his lips,

and drank half a pint without stopping to take breath.

"'Tis a long time since I tasted such rich and luscious wine,

gentlemen," said the peasant, handing back the bottle.

"Pray be seated and rest awhile," urged his companions, and nothing

loath to keep such excellent company, Hans, if such was really his name,

sat down by the fire.

"Pray, what brings you to the lonely Schwarzwald, gentlemen? Have you

come to hunt for the wild boar, or to fish the mountain streams?" he

asked, "for I can show you where the biggest fish are to be found, and

where the wild pig rears her litters."

"Butterflies and birds, especially birds," replied Keane, pointing to

his nets, and his neat little boxes for packing specimens.

"Birds? Ach, there is one bird which sometimes flies in these parts

which you will never catch," said the peasant, speaking in lowered

tones, as though half-frightened by his own words.

"Ha! What bird is that?" asked the others.

"Hist!" exclaimed Hans, raising his forefinger, and looking guardedly

around. "It is the phantom-bird!"

"The phantom-bird?" echoed the two airmen, who could scarcely believe

their eyes and ears, as they earnestly regarded this solemn, frightened,

half-childish man, who had evidently seen the very thing they had come

so far to find, but who believed it to be something supernatural.

The two Englishmen glanced at each other. Had they really found someone

who could enlighten them about this mysterious aeroplane, for he could

certainly be referring to nothing else? And at that moment Keane

blessed his lucky star, which had led him to choose these wild forest

regions for their jumping-off ground. Still, they must not appear too

curious, lest they should betray the reason of their presence here.

Keane shook his head as, with an apparently incredulous laugh, and a

sympathetic motion of the hand, he would banish all tales of ghostly

visitants to the realm of limbo. This only had the effect of egging on

the speaker to tell his tale, however.

"Ach, Himmel!" he exclaimed. "Es war geistlich!"

"Did you see it, then?"

"Ya, das hab ich!" returned the other.

"Was it in the day or the night-time when you saw it?" asked Sharpe.

"It was night, about this time, and there was but a half-moon above the

tree tops."

"Were you very much frightened, Hans?"

"Yes, I was scared to death almost. I thought the old man of the

mountains had come for me. I had been to market to sell my little

wooden-clocks, and near this very place the huge grey phantom bird

swooped down, then circled round and round and disappeared there, over

there!" and the peasant, his eyes almost starting out of his head with

terror, pointed away to the east.

"Bah! It was no bird, it was an aeroplane, Hans. You should not have

been frightened," exclaimed Keane, who had been taking particular note

of the direction in which the mysterious machine had disappeared.

"Yes, a ghost-aeroplane!" iterated the Schwarzwalder. "There has never

been anything like it before."

"Did anybody else see it?" queried Sharpe, passing the bottle once again

to Hans, who stayed but a moment to wipe his lips with his sleeve, and

to take another deep drink of the wine.

"Ja, it was seen by Jacob Stendahl the same night, not far from this

very place."

"And who is Jacob Stendahl?" asked Keane.

"He is the woodcutter whose cottage is down by the stream, two miles

away. That path leads to his house. He was terrified; he said it was

an evil omen, and next morning his little Gretchen died."

"And what happened to you, Hans?" asked Sharpe.

"That same night my sow farrowed, and all the litter were dead next

morning," replied the peasant gravely.

A deep silence followed this last remark, and the Schwarzwalder brooded

over his misfortune, and lamented to himself the loss of his fine litter

of young pigs.

The two airmen felt certain now that Hans had really seen the mysterious

aeroplane, and they plied him with a dozen further questions as to the

noise it made in passing, and the speed at which it travelled, and

whether anyone else had seen or heard of it. To some of their questions

Hans could give no coherent answer. He said, however, that very few

people lived in this part of the forest, and parts of it were seldom or

never trodden by human foot. He had spoken to one or two about it, and

they also had either seen or heard of it from someone else, and the

general opinion amongst the Schwarzwalders in that part, was, that it

was one of the dead German airmen, whose spirit came to visit the spot

in a ghost-aeroplane.

"Which of the German aces is it, then, that revisits this place, do they

think?" asked Keane.

"Some say that it is the ghost of Immelmann, who used to come here

before the war to hunt the wild boar; others say that it is the spirit

of Richthofen, but I cannot say," replied Hans.

On the question of speed and noise, however, the peasant declared that

he was certain.

"It must have been a ghost-aeroplane," he said, "because it was silent,

and its speed was like the passing of a spirit when it leaves the body."

A deep silence followed these words, but at the end of a few minutes

Hans, pointing to the east, said:--

"Look, friends, the moon is rising already. It is getting lighter, and I

must go."

Then, untethering his pack-horse, he thanked the strangers for their

hospitality, gave them the direction and situation of his cottage, where

they would be welcome, should they care to visit him during their stay

in the Schwarzwald, and, bidding them adieu, started off on his journey

through the forest.

*CHAPTER XVII*

*THE WATCHERS*

They watched the Schwarzwalder and his beast of burden disappear into

the forest, then for some minutes the two Englishmen, buried in thought,

sat by the embers of the fire. Neither spake to his companion for a

while, as, deep in contemplation, each endeavoured to fathom in his own

mind this secret of the phantom aeroplane, this riddle of the sphinx.

At last Keane addressed his colleague.

"This travelling clock-maker has confirmed our theory, Sharpe," he said.

"Yes, the simple fellow has helped us not a little," replied the other.

"We must continue our search without further delay, lest this talkative

peasant should himself encounter this genius, and unwittingly announce

the presence of two strangers in the forest. That is my great fear

now."

"You don't think this fellow misled us, Keane?"

"Why do you ask? He was too dull-witted to be anything in the nature of

an accomplice," replied the captain.

"Quite so, but he might have been a tool in the hands of this mystery

man," added Sharpe, as a sudden feeling of suspicion shot across his

mind.

"In that case we ought to have followed him, but I scarcely think it

worth while. A dull-witted man of that type would have been too

dangerous to his employer, even when used merely as a tool. The only

danger I anticipate from that quarter, unless I am utterly mistaken, is

that the fellow may encounter someone in the forest who is engaged in

the plot, and thus reveal our presence, as I stated previously,"

observed Keane, as he began to get his traps together, ready for the

march.

"Anyhow, we have learned something from the Schwarzwalder."

"By the way, Sharpe, you might tune up your little wireless pocket

'phone, and ascertain if there are any messages floating around."

"So I will; we might pick up something," replied the junior airman, and

the next moment he climbed into a straggling, low-branched tree,

uncoiled a small aerial, and, starting his little battery, listened

attentively for any stray message that might be floating through the

ether.

"Anything?" asked Keane, coming to the foot of the tree.

"Nothing," remarked the other.

"Then we'll push off."

Five minutes later, having adjusted their packs, collected their nets,

and having stamped out the remains of the fire, they were ready to

start.

"Which path shall we take?" asked Sharpe, for there were two

ill-defined, grass-grown tracks which led away from the clearing. One

led past Jacob Stendahl's cottage, and had been followed by the

Schwarzwalder, and the other, the lesser trodden of the two, led they

knew not where.

"Let us take the one on the right," said Keane, indicating the latter.

"It is more likely to yield us something," and the next moment they were

hidden from sight amid the dense undergrowth of this part of the forest.

Scarcely had they disappeared from view when one of the upper branches

of a tree near to the edge of the clearing suddenly appeared to move,

then to swing loosely for a second, and drop to the ground. Then for a

moment there was silence, save for the call of a nightjar which had been

disturbed, but a moment later a dark shadow debouched from the edge of

the forest and crossed quietly but quickly to where the fire had been

burning a few minutes previously.

A low whistle, repeated twice, brought a similar shadow from the

opposite side of the clearing, and the two indistinct, but human shapes,

met each other face to face.

"Who were they, Professor?" asked the second arrival of the first.

"Himmel! Ich weiss nicht, Strauss," replied his companion, who was none

other than the renowned Professor Rudolf Weissmann, "but I fear that

they portend us no good."

"Let us examine the ground to see if they have left any clue behind."

So for the next few minutes the professor and his mechanic searched the

ground carefully for any little souvenir which the travellers might have

left behind them. And whilst they searched, they talked in low, but

eager whispers.

"Did you hear that half-witted Schwarzwalder talking aloud about the

_Scorpion_?" asked the professor.

"Yes. He called it a phantom-bird, did he not?" replied Strauss. "I

heard nearly all he said, he spoke so loudly and coarsely."

"Could you hear what the others said?"

"Not a word; they spoke so quietly, save once or twice when they spoke

to the clock-maker."

"Nor could I, and that is what makes me so suspicious," returned

Weissmann.

"They spoke good German, though," ventured the mechanic.

"Bah! Of course they would. Nevertheless, it's my firm opinion that

they're foreigners, and that they're here for some special reason."

"And that reason is?"

"To find out about the _Scorpion_," snarled the mathematician.

"Ach!" exclaimed the other; "the _Scorpion_ is two thousand miles away."

"Then their next business is to find the aerodrome," said the professor.

"Blitz! that they'll never do except by accident. Think of those live

wires waiting for them if they get within a hundred yards of it. We

have found six dead men there already; I don't want to dig any more

graves," returned Strauss.

They had continued the search for fully ten minutes, and the professor,

occasionally flashing his pocket torch, was carefully examining the long

grass within a radius of some twelve of fifteen feet of the spot where

the fire had been. Wise man that he was, he carried out his final

investigation to the leeward of the fire, trusting that the breeze might

have carried some paper fragment, used in lighting a pipe or starting

the fire, in that direction. Nor was he disappointed. He was just about

to conclude his search, however, when his sharp eyes caught sight of a

piece of half burnt and twisted paper hidden away amongst the longer

grass.

"Donnerwetter!" he exclaimed under his breath, as he flashed his torch

upon the paper for a second. "I thought so; here is evidence enough for

an execution."

"What is it, mein herr?" asked the mechanic, hastening to his side.

"Do you see that?" said his companion, untwisting the paper once again

and flashing a light upon it.

"Ja! ja!" replied the other as he strained his eyes in the attempt to

decipher the handwriting on the half-burnt sheet. "But I cannot

understand it, for it is in a foreign language."

"It is part of a small fragment of an envelope, and the writing, which

is in English, is certainly almost undecipherable, but I can distinguish

the letters '...eane'."

"Ach, Himmel! That is Keane!" replied Strauss. "He is one of the

aerial police, is he not?"

"You are right, Fritz. This letter was addressed through the English

post to Captain Keane, one of Tempest's best men, if not indeed his most

brilliant 'brain-wave,'" hissed the professor.

"Donner und blitzen! Then he has come here to search for the

_Scorpion_, and the aerodrome."

"Yes, but look, he only left London a few hours ago, for here is the

London postmark in the corner, bearing yesterday's date."

"And his companion? Who is he?" asked the mechanic.

"It must be that other scout pilot, Sharpe; they work together. But,

mark my word, Friedrich Strauss, they are mistaken if they think to find

an easy victim in Professor Rudolf Weissmann. I'll teach them to track

me like a murderer through the Schwarzwald. They have come to the Black

Forest, and here they shall stay." And for once, the quiet,

mild-mannered professor jerked out his words with unusual vehemence.

The mechanic saw that his chief was deeply agitated by this sudden

discovery, which confirmed all his recent fears, and to allay his

feelings, he said,

"But they will never find the aerodrome, Professor, or, if indeed they

find it, they will never enter it alive; think of the preparations you

have made for all uninvited guests," and the speaker shuddered, for he

knew something of the terrors of that "death-circle" in the lonely

forest.

"Bah! it is my secret they want, the secret of that mysterious power

which drives the _Scorpion_."

"Uranis?" ventured the other.

The professor nodded, for he regarded it as the greater success of the

two. Without it the _Scorpion_ would be useless; with it a dozen

_Scorpions_ could be built, once the facilities were provided.

Unfortunately the discovery had been effected too late to win the war

for the Fatherland. Besides, he had not received the encouragement from

the government that he had deserved, and his soul was consequently

embittered.

"Come," he said at last, "we must get back to the aerodrome and watch

for these half-witted Englishmen. Once there we can afford to laugh at

them. They will soon be held in a vice. But I must send a further

message to the _Scorpion_ out on the Hamadian plains, hinting how

matters stand. After that communications may have to cease for a while.

As for these death-hunters, they will find out presently that they are

up against something far more terrible than anything which old Jacob

Stendahl or the wood-cutter have ever imagined in their wildest fancy.

The secret of the Schwarzwald is not for them. I hold the master-key,

Fritz, and when I die that master-key will be broken."

And the two men, who had been aware of the presence of the Englishmen

ever since they entered the forest, and had watched them accordingly,

now moved off in the same direction which the latter had taken half an

hour before.

*CHAPTER XVIII*

*"LIVE WIRES"*

Matters in the Schwarzwald were now rapidly nearing a climax; the final

contest between German brains and English wit could not much longer be

delayed. For the moment Keane and Sharpe, unknown to themselves, were

enmeshed in the network of a deathly trap. Nothing less than a miracle,

or something approaching the same, could now set them free from their

perilous position. One thing was certain, and that was that this clever

but unscrupulous mathematician and engineer, who was now their declared

enemy, would not hesitate to adopt the most extreme measures to get rid

of his unwelcome visitors. Unfortunately his power, which almost

approached the supernatural, made him a dangerous and a wily foe.

It was now past midnight, but the two Englishmen, who had left the track

some time before at a point where its course was suddenly changed, and

had continued their journey by the aid of a luminous compass, and the

uncertain light of the moon, came at last to another halt.

"Let us stay here a while, Sharpe," his companion had whispered. "I

have a strong premonition of some impending danger."

"The deuce you have!" remarked Sharpe, who well knew what this meant in

a man like Keane, whose psychic faculties were not to be sneered at.

"Yes. I cannot explain it, but there is some hidden danger right ahead

of us; of that I am as certain as that we are in the Schwarzwald. We

had better lie down a while and await developments quietly."

Nothing loath, Sharpe unfastened his shoulder straps, slid his equipment

quietly to the ground, and laid himself down beside his companion.

For the moment all was quiet. The moon was hidden behind a bank of

clouds, and it was therefore very dark, but sounds travel far in the

night air of the forest, and when they conversed, they spoke only in

whispers.

"It may be," remarked Keane, "that the spot we seek is just in front of

us, though I cannot see any glade or clearing as yet; it is too dark."

"Is it likely that there are any booby-traps hereabouts, set by this

wily professor?" asked his companion.

"I cannot say; he may have some outer system of defence."

"Or even a system of ground signals to announce the approach of

strangers, whose presence might be undesirable to him," added Sharpe.

"It is possible," whispered Keane, whose mind was actively engaged in

preparation for eventualities, in view of his inexplicable premonitions.

Suddenly he started and touched his comrade lightly with his raised

forefinger.

"Hist!" he said, in a voice which could not have carried further than a

couple of yards Then he carefully raised his head, and, turning his eyes

towards the thicket through which they had come, he tried to read the

secret which it contained. His alarm was justified, yet was he

mystified not a little, for the more immediate danger seemed to come

from behind.

"Can you hear it, Sharpe?"

"Yes, the same crackling of twigs; another wild boar," remarked his

friend facetiously.

Keane shook his head, for his sensitive ears had told him that the

footsteps which he had heard were those of human beings. Nor was he

mistaken, for a moment later they both heard distinctly, not merely the

crackling of twigs and the rustle of the bracken under heavy footfalls,

but voices, human voices, conversing in a guarded and careful manner.

"None of your Schwarzwald peasants this time," he murmured, fingering

his Webley already, for he instinctively felt that this time they were

beset by danger both before and behind. And indeed, these two men,

during all their adventures in the secret service during the war, were

never in more deadly peril than at this moment, as they were soon to

learn.

Scarcely daring to breathe, much less to whisper now, the two Englishmen

watched furtively for the coming of the strangers, who were now less

than a score of yards away, but were approaching very stealthily, as

though they were searching for something on the ground.

"Who can they be?" wondered Keane. "And what can they be searching for?"

"Poachers," Sharpe was thinking, "merely poachers, searching for their

booby-traps."

Nearer and nearer came the dark shadows, and both the airmen had their

Webleys trained on them now. In that moment they might have shot them

down easily, and before long they would regret they had not done so.

But that is not the English way, for the ordinary Englishman would give

even a dog his chance, as the saying goes. Still, there are dogs and

dogs, and sometimes human dogs are worse than the four-footed ones. But

the Englishmen were uncertain; they did not know what world-wide

conspirators were these two men. They did not know what fearful deeds

would happen even that day on the Hamadian desert, two thousand miles

away, but all of it engineered from this spot, and made possible by

these two men. And as they did not know, they did not fire, but waited.

"Gott in Himmel, where does that _verdammt_ live wire begin?" asked one

of the men in a low but vehement voice. It was the professor himself,

searching for one of his own man-traps.

Sharpe glanced at Keane, but the other motioned him not to fire.

"We're learning something, old man!" he whispered. "This is the gateway

to the aerodrome."

The two men had passed them now, passed within six yards, and yet had

missed them. They were now groping a little way ahead, looking for

secret signs and marks lest they should be hoist upon their own petard.

"Donner und Blitzen! Have you found it yet, Fritz?" called the

professor a little louder to his friend.

"Here it is, Professor! Be careful ... there are six wires already laid

for those _verdammt_ Englishmen, Keane and--what is the name of the

other?"

"Sharpe!" rapped out the professor, as though he had known the man all

his life.

At these words the two Englishmen looked at each other in blank

amazement. And before their astonishment could subside, the opportunity

which had been given to them of ridding the world of two great

conspirators had passed.

"One--two--six!" they heard the mechanic say, as he helped the professor

over the deadly maze, scarcely fifteen yards in front of them, and then

their dark forms had merged into the trees and disappeared, their voices

becoming fainter and fainter.

"Great Scott!" gasped Sharpe, when he recovered from his astonishment;

"we've walked right into the hornets' nest."

"We should have done if we'd gone another fifteen yards," replied Keane,

wiping the perspiration from his forehead.

"Fortunate you had that presentiment of impending danger," said his

friend.

"We should have been lying dead and half grilled over his deadly wires

but for that strange, weird feeling of mine," replied Keane.

"But there, after all our attempts at concealment, he knows all about

us."

"Even our names seem familiar to him," remarked the senior airman,

greatly puzzled.

"I cannot understand it," replied the other. "Who can have given him

this information?"

"Who indeed?" asked Keane. "It is as great a mystery as the other

matter."

"Can it be the woodcutter or the clockmaker, do you think, for Hans is

sure to have called at Jacob Stendahl's cottage and told him the news."

But Keane shook his head, as he remarked: "Neither Hans nor yet the

woodcutter could possibly have told the professor our names. This evil

genius must have other sources of information at his command. Possibly

he has an agent at Mulhausen aerodrome, or even at Scotland Yard. To a

man like this, a thousand ways are open. I cannot say, but this I know,

we are on the edge of the biggest mystery I have ever encountered."

"And we might easily have shot him. Bah! it would have been better to

have fired, Keane," added Sharpe somewhat bitterly. "Cannot we follow

him now?"

"No!" replied his companion, firmly. "It is better as it is."

"Why?" demanded the other.

"Rest content, Sharpe," said Keane. "To-day we have discovered the

aerodrome; to-morrow we will capture it."

*CHAPTER XIX*

*THE DEVIL'S WORKSHOP*

Patiently, now, the two Englishmen waited for the dawn. Till then it

would not be safe to move in any direction. As they lay in the long

bracken and ferns, however, they were able to converse quietly, and to

discuss their plans for the coming day. The spot they had come so far

to seek was now before them. The live wires, just a few feet ahead of

them, had been duly located, and now that the danger was known, it was

not insuperable. It was an added mystery to them, nevertheless, how

this wizard secured sufficient voltage to make these wires so deadly.

They assumed, however, that powerful dynamos, worked by this same silent

energy that propelled the aeroplane, were at work somewhere near this

spot.

Dawn came at last; a faint yellow streak lit up the horizon away to the

east. Then a crimson flush revealed the distant tree-tops, and the moon

and stars faded away. A hundred songsters awoke the stillness of the

forest, for another day had dawned, and the sable curtain of night

rolled westward.

"See, there is a clearing fifty yards ahead," were Keane's first words

to his companion.

"It is the aerodrome, the secret aerodrome!" replied Sharpe, peering

through the trees.

"Let us work round a little way and find the workshop or hangar. I

fancy we shall find it on the other side of the glade."

"Mind those beastly wires, then!" replied Sharpe, as he began to crawl

through the dense undergrowth after his companion, who had already

started to make a circuit of the outer defences on his hands and knees.

The next half-hour was spent in cautious creeping and crawling just

outside those death-dealing wires. At the end of that time, however,

Keane made a discovery. He had completed about half the circuit, when,

peering carefully through the trees, he fancied he could make out the

camouflaged fabric which covered some temporary building. So carefully

was this place hidden amongst the trees that he had to look twice or

three times before he could make up his mind that he was not mistaken.

At last he convinced himself that he had located the workshop, else, why

should the place have been so carefully hidden. Waiting for his

companion to reach him, he pointed to the object and whispered, "There

it is, not thirty yards away!"

"Shall we get over these wires, and rush the place?" asked Sharpe.

"No. Let us continue our journey until we have completed the circuit.

We may make another discovery yet. Come along; fortune favours the

brave."

They had scarcely crept another hundred yards, however, when a rustling

in the leaves, accompanied by a snort, revealed the presence of another

wild boar, which had evidently scented their presence.

"Confound the pig!" muttered Sharpe, who was afraid the sounds might

lead to their premature discovery. But Keane thought otherwise, for, to

his quick mind and instructive genius, this trifling event seemed

providential.

"The pig!" he whispered, pointing to the spot whence came the occasional

snorts of the angry, disturbed creature.

"What of it?" queried Sharpe.

"Let's get to the other side of the beast and drive it against the

wires."

"And roast the brute alive for the benefit of their breakfast, I

suppose."

Keane laughed silently, and wondered how far the conspirators used this

live wire to keep themselves supplied with food. He knew, however, that

a wild boar on the live wires would soon bring out the inmates of that

mysterious house in the woods, and would sufficiently distract their

attention to give the airmen their opportunity.

The next moment, having made a sufficiently extensive circuit, so as to

get the wild boar between them and the wires, they began closing in on

the beast, an operation not devoid of peril, should the boar decide to

attack them. Fortune favoured them, however. The angry beast, noting

the approach of some unseen enemy, by the movements of the tangled

undergrowth, half frightened and half infuriated, made off in the

direction of the clearing, uttering further snorts. The next moment he

had touched the first of those deadly wires, and, with a wild scream

which rang through the forest, he leapt into the air, then fell back

quivering but dead across that fatal grill.

"Back--back for your life!" hissed Keane, as he made haste back to the

spot where they had sheltered, close to the camouflaged hangar.

The next instant the watchers saw the professor and his assistant rush

out of the little building, towards the place where the animal lay right

across the first four wires. In their excitement they both seemed to

have forgotten the presence of the two Englishmen in the woods during

the previous evening, for they were both unarmed. Or perhaps it was

that they imagined them to be the present victims of their cunning.

"Hoch! Another royal boar for the larder, Fritz!" exclaimed the

professor. "We shall have the winter's supply complete very soon."

"Gut, mein herr!" came the answer.

"Better go back and switch off the current, so that we can take it

away," urged the chief, and, staying but a second to see the royal

victim, the assistant complied.

This was what the two Englishmen had been waiting for. The moment of

action had come at last. Gripping their pistols, they made ready to

advance and take possession of the hangar during the absence of the

inmates.

"Sind Sie fertig, Friedrich?" called the professor.

"Ja, das bin ich!" replied the other, as he left the workshop, and

rejoined his companion.

"Come along, the wires are dead now," whispered Keane, and, keeping well

within the shadows of the trees, the two men crept forward, gained the

rear of the structure, then cautiously worked their way round and

entered the hangar unobserved.

One glance about the well-fitted workshop sufficed. There were no

further occupants, and they lowered their pistols. Sharpe at once

sprang to the lever which regulated the powerful electrical current and

clutched it. In another instant the two men without would have paid the

extreme penalty, for they would have been instantly killed by their own

evil device, but Keane stopped him:--

"Don't!" he said. "We have much to learn. The professor at least must

be taken alive, if possible. The secret he holds is too precious to be

lost. Let us hide!"

"Where can we hide?" asked the other, somewhat disappointed, and amazed

at the further risks which his companion appeared willing to take in

order to gratify an insatiable curiosity. "The tables may be quickly

turned upon us."

"We can shoot them as a last resort, if that is necessary," urged Keane,

who knew the priceless value of the secrets which this place contained.

"Hist! They are coming."

"This way!" whispered Keane, and he drew his companion into a little

recess, which had evidently been curtained off for the mechanic's

sleeping berth.

They had barely withdrawn themselves into this narrow apartment when the

two men entered, dragging the carcase of the wild boar with them.

"Leave it there for a moment, Strauss. The message from the Rittmeister

is due. I must also send him that other message again, as the first has

not been acknowledged," were the professor's first words.

"Yes, sir. Shall I start the dynamos again?" asked the assistant.

"Perhaps you'd better, but first hand me that message book and the

secret code."

The next moment the professor was busy at the wireless keys,

transmitting some message to the far deserts of Arabia.

"By all the saints," gasped Keane, "he's sending a message to the

raider, the _Scorpion_, as he calls it. I must have that secret code at

all hazards. I wonder what he is saying?"

For some time the chief conspirator was engaged coding and decoding

messages at the little table where the aerials, carefully hidden amongst

the trees without, had their terminus. And in that moment Keane thanked

his stars that he had waited for this, for he saw new possibilities

opening out before him. Once in possession of this mechanism and the

necessary codes, he could communicate at will with the distant raider,

who was threatening the whole civilised world by his almost superhuman

powers of brigandage. He could recall the raider also, and make his

capture certain, once he could secure absolute possession of this little

citadel.

For the present he could do nothing but wait, however, and see how

matters developed. Once, the assistant came quite close to their

hiding-place, and both men again gripped their Webleys. At this moment

even to breathe seemed fraught with danger. If the man should enter the

little apartment, he must die, and the professor must be immediately

threatened with the same penalty unless he surrendered.

"Ha! So far so good!" gasped Keane, as the mechanic recrossed the

workshop without actually entering their hiding-place.

"Teufel!" spluttered the professor. "Here is that fool Tempest trying

to communicate with those two _verdammt_ Englishmen who are still

roaming about in the Schwarzwald. He little knows that we possess his

secret code."

"Himmel! What does he say?" asked the other.

"Wants them to report progress at once, and let him know how matters

stand," said Weissmann in a mocking tone. "He says he will come over

himself, if necessary."

"Donnerwetter! Ask him to come, Professor. He might as well grill with

his accomplices on the live wires, for that's where they'll be before

the day is out, unless they abandon their futile search," replied

Strauss.

"This fiend is a perfect wizard!" thought Keane, and his glance

signified as much to Sharpe. "How he manages to get hold of these

secrets is beyond me. And yet, there is a defect in his mad science,

for he does not know that we're here, and that his own life is in our

hands. Fool that he is, he will soon learn that the wit of an

Englishman is more than a match for his boasted knowledge," and here the

senior airman carefully withdrew a cartridge from his Webley and

inserted another, silently--a cartridge that had a specific mission.

His companion watched him and repeated the action with his own weapon,

for he understood.

"Blitz! but I've half a mind to send for Tempest," mused the professor,

who was still toying with the keys of the wireless instrument.

"Send for him, Professor," urged his accomplice. "Those Englishmen are

getting too close to be pleasant. The British army of occupation will

be carrying out a thorough search of the Schwarzwald if these men get

away, and then where shall we be?"

"We are in the neutral zone, though," replied the other.

"But we're contravening the Peace Regulations, sir, and the English will

not stand upon ceremony. It will be too late should these men get

away."

"Donner und Teufel!" rasped out the angry professor. "Don't speak to me

of the Peace Regulations. There will be no peace till Germany regains

all and more than all she has lost. I will send for this Commissioner

of Aerial Police, for I believe that he and his two accomplices, Keane

and Sharpe, are the only ones so far who know anything that matters

about the secret of the Schwarzwald," and he began to tap the keys,

reeling out the words as he sent them.

The Phantom Airman · 第 5 / 8 题