"Ether," exclaimed Kennedy. "Stand back farther with those lights

and hold them up from the floor."

For a moment he seemed to hesitate as if at loss what to do next.

Should he open the door and let this highly inflammable gas out or

should he wait patiently until the natural ventilation of the little

office had dispelled it?

While he was debating he happened to glance out of the window and

catch sight of a drug-store across the street.

"Walter," he said to me, "hurry across there and get all the

saltpeter and sulphur the man has in the shop.

I lost no time in doing so. Kennedy dumped the two chemicals into

a pan in the middle of the main office, about three-fifths saltpeter

and two-fifths sulphur, I should say. Then he lighted it. The

mass burned with a bright flame but without explosion. We could

smell the suffocating fumes from it, and we retreated. For a moment

or two we watched it curiously at a distance.

"That's very good extinguishing-powder," explained Craig as we

sniffed at the odour. "It yields a large amount of carbon dioxide

and sulphur dioxide. Now - before it gets any worse - I guess

it's safe to open the door and let the ether out. You see this is

as good a way as any to render safe a room full of inflammable

vapour. Come, we'll wait outside the main office for a few minutes

until the gases mix.

It seemed hours before Kennedy deemed it safe to enter the office

again with a light. When we did so, we made a rush for the little

cubby-hole of an office at the other end. On the floor was a little

can of ether, evaporated of course, and beside it a small apparatus

apparently used for producing electric sparks.

"So, that's how he does it," mused Kennedy, fingering the can

contemplatively. "He lets the ether evaporate in a room for a while

and then causes an explosion from a safe distance with this little

electric spark. There's where your wire comes in, McCormick. Say,

my man, you can switch on the lights from downstairs, now."

As we waited for the watchman to turn on the lights I exclaimed,

"He failed this time because the electricity was shut off."

Precisely, Walter," assented Kennedy.

"But the flames which the night watchman saw, what of them?" put in

McCormick, considerably mystified. "He must have seen something."

Just then the lights winked up.

"Oh, that was before the fellow tried to touch off the ether vapour,"

explained Kennedy. "He had to make sure of his work of destruction

first - and, judging by the charred papers about, he did it well.

See, he tore leaves from the ledgers and lighted them on the floor.

There was an object in all that. What was it? Hello! Look at this

mass of charred paper in the corner."

He bent down and examined it carefully. "Memoranda of some kind, I

guess. I'll save this burnt paper and look it over later. Don't

disturb it. I'll take it away myself."

Search as we might, we could find no other trace of the firebug, and

at last we left. Kennedy carried the charred paper carefully in a

large hat-box.

"There'll be no more fires to-night, McCormick," he said. "But I'll

watch with you every night until we get this incendiary. Meanwhile

I'll see what I can decipher, if anything, in this burnt paper."

Next day McCormick dropped in to see us again. This time he had

another note, a disguised scrawl which read:

Chief I'm not through. Watch me get another store yet.

I won't fall down this time.

Craig scowled as he read the note and handed it to me. "The man's

A. SPARK.

writing this time - like the second note," was all he said.

"McCormick, since we know where the lightning is going to strike,

don't you think it would be wiser to make our headquarters in one

of the engine-houses in that district?"

The fire marshal agreed, and that night saw us watching at the

fire-house nearest the department-store region.

Kennedy and I were assigned to places on the hose-cart and engine,

respectively, Kennedy being in the hose-cart so that he could be

with McCormick. We were taught to descend one of the four brass

poles hand under elbow, from the dormitory on the second floor.

They showed us how to jump into the "turn-outs" - a pair of trousers

opened out over the high top boots. We were given helmets which

we placed in regulation fashion on our rubber coats, turned inside

out with the right armhole up. Thus it came about that Craig and I

joined the Fire Department temporarily. It was a novel experience

for us both.

"Now, Walter," said Kennedy, "as long as we have gone so far, we'll

'roll' to every fire, just like the regulars. We won't take any

chances of missing the firebug at any time of night or day."

It proved to be a remarkably quiet evening with only one little

blaze in a candy-shop on Seventh Avenue. Most of the time we sat

around trying to draw the men out about their thrilling experiences

at fires. But if there is one thing the fireman doesn't know it is

the English language when talking about himself. It was quite late

when we turned into the neat white cots upstairs.

We had scarcely fallen into a half doze in our strange surroundings

when the gong downstairs sounded. It was our signal.

We could hear the rapid clatter of the horses' hoofs as they were

automatically released from their stalls and the collars and

harness mechanically locked about them. All was stir, and motion,

and shouts. Craig and I had bounded awkwardly into our

paraphernalia at the first sound. We slid ungracefully down the

pole and were pushed and shoved into our places, for scientific

management in a New York fire-house has reached one hundred per

cent efficiency, and we were not to be allowed to delay the game.

The oil-torch had been applied to the engine, and it rolled forth,

belching flames. I was hanging on for dear life, now and then

catching sight of the driver urging his plunging horses onward like

a charioteer in a modern Ben Hur race. The tender with Craig and

McCormick was lost in the clouds of smoke and sparks that trailed

behind us. On we dashed until we turned into Sixth Avenue. The

glare of the sky told us that this time the firebug had made good.

"I'll be hanged if it isn't the Stacey store again, shouted the man

next me on the engine as the horses lunged up the avenue and

stopped at the allotted hydrant. It was like a war game. Every

move had been planned out by the fire-strategists, even down to the

hydrants that the engines should take at a given fire.

Already several floors were aflame, the windows glowing like

open-hearth furnaces, the glass bulging and cracking and the flames

licking upward and shooting out in long streamers. The hose was

coupled up in an instant, the water turned on, and the limp rubber

and canvas became as rigid as a post with the high pressure of the

water being forced through it. Company after company dashed into

the blazing "fireproof" building, urged by the hoarse profanity of

the chief.

Twenty or thirty men must have disappeared into the stifle from

which the police retreated. There was no haste, no hesitation.

Everything moved as smoothly as if by clockwork. Yet we could not

see one of the men who had disappeared into the burning building.

They had been swallowed up, as it were. For that is the way with

the New York firemen. They go straight to the heart of the fire.

Now and then a stream of a hose spat out of a window, showing that

the men were still alive and working. About the ground floors the

red-helmeted salvage corps were busy covering up what they could

of the goods with rubber sheets to protect them from water.

Doctors with black bags and white trousers were working over the

injured. Kennedy and I were busy about the engine, and there was

plenty for us to do.

Above the shrill whistle for more coal I heard a voice shout,

"Began with an explosion - it's the fire- bug, all right." I

looked up. It was McCormick, dripping and grimy, in a high state

of excitement, talking to Kennedy.

I had been so busy trying to make myself believe that I was really

of some assistance about the engine that I had not taken time to

watch the fire itself. It was now under control. The sharp and

scientific attack had nipped what might have been one of New York's

historic conflagrations.

"Are you game to go inside?" I heard McCormick ask.

For answer Kennedy simply nodded. As for me, where Craig went I

went.

The three of us drove through the scorching door, past twisted

masses of iron still glowing dull red in the smoke and steam, while

the water hissed and spattered and slopped. The smoke was still

suffocating, and every once in a while we were forced to find air

close to the floor and near the wall. My hands and arms and legs

felt like lead, yet on we drove.

Coughing and choking, we followed McCormick to what had been the

heart of the fire, the office. Men with picks and axes and all

manner of cunningly devised instruments were hacking and tearing

at the walls and woodwork, putting out the last smouldering sparks

while a thousand gallons of water were pouring in at various parts

of the building where the fire still showed spirit.

There on the floor of the office lay a charred, shapeless,

unrecognisable mass. What was that gruesome odour in the room?

Burned human flesh? I recoiled from what had once been the form of

a woman.

McCormick uttered a cry, and as I turned my eyes away, I saw him

holding a wire with the insulation burned off. He had picked it

up from the wreckage of the floor. It led to a bent and blackened

can - that had once been a can of ether.

My mind worked rapidly, but McCormick blurted out the words before

I could form them, "Caught in her own trap at last!"

Kennedy said nothing, but as one of the firemen roughly but

reverently covered the remains with a rubber sheet, he stooped down

and withdrew from the breast of the woman a long letter-file.

"Come, let us go," he said.

Back in our apartment again we bathed our racking heads, gargled our

parched throats, and washed out our bloodshot eyes, in silence. The

whole adventure, though still fresh and vivid in my mind, seemed

unreal, like a dream. The choking air, the hissing steam, the

ghastly object under the tarpaulin - what did it all mean? Who was

she? I strove to reason it out, but could find no answer.

It was nearly dawn when the door opened and McCormick came in and

dropped wearily into a chair. "Do you know who that woman was?" he

gasped. " It was Miss Wend herself."

"Who identified her?" asked Kennedy calmly.

"Oh, several people. Stacey recognised her at once. Then Hartstein,

the adjuster for the insured, and Lazard, the adjuster for the

company, both of whom had had more or less to do with her in

connection with settling up for other fires, recognised her. She

was a very clever woman, was Miss Wend, and a very important cog in

the Stacey enterprises. And to think she was the firebug, after

all. I can hardly believe it."

"Why believe it?" asked Kennedy quietly.

"Why believe it?" echoed McCormick. "Stacey has found shortages in

his books due to the operation of her departments. The bookkeeper

who had charge of the accounts in her department, a man named

Douglas, is missing. She must have tried to cover up her operations

by fires and juggling the accounts. Failing in that she tried to

destroy Stacey's store itself, twice. She was one of the few that

could get into the office unobserved. Oh, it's a clear case now.

To my mind, the heavy vapours of ether - they are heavier than air,

you know - must have escaped along the surface of the floor last

night and become ignited at a considerable distance from where she

expected. She was caught in a back-draught, or something of the

sort. Well, thank God, we've seen the last of this firebug business.

What's that?"

Kennedy had laid the letter-file on the table. "Nothing. Only I

found this embedded in Miss Wend's breast right over her heart."

"Then she was murdered?" exclaimed McCormick.

"We haven't come to the end of this case yet," replied Craig

evasively. "On the contrary, we have just got our first good clue.

No, McCormick, your theory will not hold water. The real point is

to find this missing bookkeeper at any cost. You must persuade

him to confess what he knows. Offer him immunity - he was only a

pawn in the hands of those higher up."

McCormick was not hard to convince. Tired as he was, he grabbed

up his hat and started off to put the final machinery in motion to

wind up the long chase for the firebug.

"I must get a couple of hours' sleep," he yawned as he left us,"

but first I want to start something toward finding Douglas. I

shall try to see you about noon."

I was too exhausted to go to the office. In fact, I doubt if I

could have written a line. But I telephoned in a story of personal

experiences at the Stacey fire and told them they could fix it up

as they chose and even sign my name to it.

About noon McCormick came in again, looking as fresh as if nothing

had happened. He was used to it.

"I know where Douglas is," he announced breathlessly.

"Fine," said Kennedy, "and can you produce him at any time when it

is necessary?"

"Let me tell you what I have done. I went down to the district

attorney from here - routed him out of bed. He has promised to turn

loose his accountants to audit the reports of the adjusters,

Hartstein and Lazard, as well as to make a cursory examination of

what Stacey books there are left. He says he will have a preliminary

report ready to-night, but the detailed report will take days, of

course.

"It's the Douglas problem that is difficult, though. I haven't seen

him, but one of the central-office men, by shadowing his wife, has

found that he is in hiding down on the East Side. He's safe there;

he can't make a move to get away without being arrested. The trouble

is that if I arrest him, the people higher up will know it and will

escape before I can get his confession and the warrants. I'd much

rather have the whole thing done at once. Isn't there some way we

can get the whole Stacey crowd together, make the arrest of Douglas

and nab the guilty ones in the case, all together without giving

them a chance to escape or to shield the real firebug?"

Kennedy thought a moment. "Yes," he answered slowly. "There is.

If you can get them all together at my laboratory to-night at, say,

eight o'clock, I'll give you two clear hours to make the arrest of

Douglas, get the confession, and swear out the warrants. All that

you'll need to do is to let me talk a few minutes this afternoon

with the judge who will sit in the night court to-night. I shall

install a little machine on his desk in the court, and we'll catch

the real criminal - he'll never get a chance to cross the state

line or disappear in any way. You see, my laboratory will be neutral

ground. I think you can get them to come, inasmuch as they know the

bookkeeper is safe and that dead women tell no tales."

When next I saw Kennedy it was late in the afternoon, in the

laboratory. He was arranging something in the top drawer of a

flat-top desk. It seemed to be two instruments composed of many

levers and discs and magnets, each instrument with a roll of paper

about five inches wide. On one was a sort of stylus with two

silk cords attached at right angles to each other near the point.

On the other was a capillary glass tube at the junction of two

aluminum arms, also at right angles to each other.

It was quite like old times to see Kennedy at work in his laboratory

preparing for a "seance." He said nothing as I watched him

curiously, and I asked nothing. Two sets of wires were attached

to each of the instruments, and these he carefully concealed and

led out the window. Then he arranged the chairs on the opposite

side of the desk from his own.

"Walter," he said, "when our guests begin to arrive I want you to

be master of ceremonies. Simply keep them on the opposite side of

the desk from me. Don't let them move their chairs around to the

right or left. And, above all, leave the doors open. I don't want

any one to be suspicious or to feel that he is shut in in any way.

Create the impression that they are free to go and come when they

please."

Stacey arrived first in a limousine which he left standing at the

door of the Chemistry Building. Bloom and Warren came together in

the latter's car. Lazard came in a taxicab which he dismissed, and

Hartstein came up by the subway, being the last to arrive. Every

one seemed to be in good humour.

I seated them as Kennedy had directed. Kennedy pulled out the

extension on the left of his desk and leaned his elbow on it as he

began to apologise for taking up their time at such a critical

moment. As near as I could make out, he had quietly pulled out the

top drawer of his desk on the right, the drawer in which I had seen

him place the complicated apparatus. But as nothing further happened

I almost forgot about it in listening to him. He began by referring

to the burned papers he had found in the office.

"It is sometimes possible," he continued, "to decipher writing on

burned papers if one is careful. The processes of colour photography

have recently been applied to obtain a legible photograph of the

writing on burned manuscripts which are unreadable by any other

known means. As long as the sheet has not been entirely

disintegrated positive results can be obtained every time. The

charred manuscript is carefully arranged in as near its original

shape as possible, on a sheet of glass and covered with a drying

varnish, after which it is backed by another sheet of glass.

"By using carefully selected colour screens and orthochromatic

plates a perfectly legible photograph of the writing may be taken,

although there may be no marks on the charred remains that are

visible to the eye. This is the only known method in many cases.

I have here some burned fragments of paper which I gathered up

after the first attempt to fire your store, Mr. Stacey."

Stacey coughed in acknowledgment. As for Craig, he did not mince

matters in telling what he had found.

"Some were notes given in favour of Rebecca Wend and signed by

Joseph Stacey," he said quietly. "They represent a large sum of

money in the aggregate. Others were memoranda of Miss Wend's, and

still others were autograph letters to Miss Wend of a very

incriminating nature in connection with the fires by another person."

Here he laid the "A. Spark" letters on the desk before him. "Now,"

he added "some one, in a spirit of bravado, sent these notes to the

fire marshal at various times. Curiously enough, I find that the

handwriting of the first one bears a peculiar resemblance to that of

Miss Wend, while the second and third, though disguised also, greatly

suggest the handwriting of Miss Wend's correspondent."

No one moved. But I sat aghast. She had been a part of the

conspiracy, after all, not a pawn. Had they played fair?

"Taking up next the remarkable succession of fires," resumed Kennedy,

"this case presents some unique features. In short, it is a clear

case of what is known as a 'firebug trust.' Now just what is a

firebug trust? Well, it is, as near as I can make out, a combination

of dishonest merchants and insurance adjusters engaged in the business

of deliberately setting fires for profit. These arson trusts are not

the ordinary kind of firebugs whom the firemen plentifully damn in

the fixed belief that one-fourth of all fires are kindled by

incendiaries. Such 'trusts' exist all over the country. They have

operated in Chicago, where they are said to have made seven hundred

and fifty thousand dollars in one year. Another group is said to

have its headquarters in Kansas City. Others have worked in St.

Louis, Pittsburgh, Cleveland, and Buffalo. The fire marshals of

Illinois, Kentucky, Tennessee, and Ohio have investigated their work.

But until recently New York has been singularly free from the

organised work of this sort. Of course we have plenty of firebugs

and pyromaniacs in a small way, but the big conspiracy has never

come to my personal attention before.

"Now, the Jones-Green fire, the Quadrangle fire, the Slawson Building

fire, and the rest, have all been set for one purpose - to collect

insurance. I may as well say right here that some people are in bad

in this case, but that others are in worse. Miss Wend was originally

a party to the scheme. Only the trouble with Miss Wend was that she

was too shrewd to be fooled. She insisted that she have her full

share of the pickings. In that case it seems to have been the whole

field against Miss Wend, not a very gallant thing, nor yet according

to the adage about honour among thieves.

"A certain person whose name I am frank to say I do not know - yet

- conceived the idea of destroying the obligations of the Stacey

companies to Miss Wend as well as the incriminating evidence

which she held of the 'firebug trust,' of which she was a member up

to this time. The plan only partly succeeded. The chief coup,

which was to destroy he Stacey store into the bargain, miscarried.

"What was the result? Miss Wend, who had been hand in glove with

the 'trust,' was now a bitter enemy, perhaps would turn state's

evidence. What more natural than to complete the conspiracy by

carrying out the coup and at the same time get rid of the dangerous

enemy of the conspirators? I believe that Miss Wend was lured

under some pretext or other to the Stacey store on the night of the

big fire. The person who wrote the second and third 'A. Spark'

letters did it. She was murdered with this deadly instrument"

- Craig laid the letter-file on the table - "and it was planned to

throw the entire burden of suspicion on her by asserting that there

was a shortage in the books of her department."

"Pooh!" exclaimed Stacey, smoking complacently at his cigar. "We

have been victimised in those fires by people who have grudges

against us, labour unions and others. This talk of an arson trust

is bosh - yellow journalism. More than that, we have been

systematically robbed by a trusted head of a department, and the

fire at Stacey's was the way the thief took to cover - er - her

stealings. At the proper time we shall produce the bookkeeper

Douglas and prove it.

Kennedy fumbled in the drawer of the desk, then drew forth a long

strip of paper covered with figures. "All the Stacey companies,"

he said, "have been suffering from the depression that exists in

the trade at present. They are insolvent. Glance over that,

Stacey. It is a summary of the preliminary report of the accountants

of the district attorney who have been going over your books to-day."

Stacey gasped. "How did you get it? The report was not to be ready

until nine o'clock, and it is scarcely a quarter past now."

"Never mind how I got it. Go over it with the adjusters, anybody.

I think you will find that there was no shortage in Miss Wend's

department, that you were losing money, that you were in debt to

Miss Wend, and that she would have received the lion's share of

the proceeds of the insurance if the firebug scheme had turned out

as planned."

"We absolutely repudiate these figures as fiction," said Stacey,

angrily turning toward Kennedy after a hurried consultation.

Perhaps, then, you'll appreciate this," replied Craig, pulling

another piece of paper from the desk. "I'll read it. 'Henry

Douglas, being duly sworn, deposes and says that one' - we'll call

him 'Blank' for the present - 'with force and arms did feloniously,

wilfully, and intentionally kill Rebecca Wend whilst said Blank

was wilfully burning and setting on fire - "

"One moment," interrupted Stacey. "Let me see that paper."

Kennedy laid it down so that only the signature showed. The name

was signed in a full round hand, "Henry Douglas."

"It's a forgery," cried Stacey in rage. "Not an hour before I came

into this place I saw Henry Douglas. He had signed no such paper

then. He could not have signed it since, and you could not have

received it. I brand that document as a forgery."

Kennedy stood up and reached down into the open drawer on the right

of his desk. From it he lifted the two machines I had seen him place

there early in the evening.

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