"I know a great deal," she replied. "I have lived with some strange

people in my time and I have heard some strange things. There are

certain quarters in the East End where they speak queer languages and

where they know things that would startle the authorities. Amongst

these people I was brought up. I learnt their ways and their methods.

Ah, it was a good school for a girl who has a treacherous world to

fight."

The speaker flung herself into a chair and hung her long white arms by

her side. The light gleamed upon her sparkling jewels and the dark eyes

that sparkled more brightly still. Frobisher watched her with something

more than artistic admiration; his thin blood was stirred.

"You speak like a Sibyl," he laughed. "If you know all about the

Cardinal Moth you also know all about the Blue Stone of Ghan, I

presume?"

Frobisher's voice was low and hoarse and persuasive. He had flung down

the challenge, and Isa Benstein was ready to receive it. She raised her

large dark eyes slowly, and they seemed to float over the faces of her

antagonists. She noted the leering grin on Frobisher's features, the

truculent bullying expression of Lefroy's.

"I have heard of that also," she said in the same level tones. "The two

are inseparable."

"Or ought to be," Frobisher went on. Evidently he was to be the

spokesman. "But if the Moth has flown far, why not the sacred jewel?

Have you ever seen it, fair lady?"

The question was a direct threat, and Isa Benstein rose to it. She sat

there swinging her long arms idly, and glancing with perfect

self-possession at her companions. They meant to have that jewel, as

she knew; they were not going to stick at anything to gain possession of

it.

"I have seen it," she said quietly; "in fact, I wore it here on my

forehead to-night."

Frobisher started. He fairly beamed with admiration. What a woman!

What a nerve! he thought. Anybody else would have denied the thing

point blank. But here was a woman prepared for any emergency. There

was going to be a battle of wits here, and Frobisher rose to the fray.

"Surely a rash thing to do," he murmured.

"Wasn't it?" Isa Benstein asked with a swift and glorious smile. "But

ignorance is bliss, you say. That being so, there ought to be a great

deal more happiness in the world than there is. Count Lefroy, won't you

sit down? No, in that other chair, so that I can see your face."

Lefroy bowed and complied. All this waste of time annoyed him, but

Frobisher, on the other hand, was enjoying himself exceedingly. Nothing

that was straight or open ever appealed to him. He would rather have

obtained a shilling by crooked means than a sovereign by holding out his

hand for it.

"You came here wearing the Blue Stone without knowing it?" he asked. "I

am interested, fascinated, and amazed. Incidentally, I am a little

amused into the bargain."

"Possibly," Isa Benstein smiled brilliantly. "But you are not half so

amused as I am."

Frobisher grinned at the way in which his challenge had been flaunted

back into his teeth. With the quick subtlety of the polyglot the woman

had grasped his scheme and what he wanted.

"It is good to feel that my guests are thoroughly enjoying themselves,"

he said politely. "I should like to know how the Blue Stone came into

your possession at all."

"Problems seem to be in the air," Isa Benstein murmured. "Your

flattering interest is very soothing to my vanity. You know what a

conjurer means when he speaks of forcing a card on a spectator? Of

course you do. The expert with his quickness and his patter can make

the spectator he selects draw any card he chooses. The conjurer in this

case chose me to force his card upon. But all the same when I came here

I had no notion that I was wearing anything half so historic as the Blue

Stone of Ghan."

"But you tound it out after you got here?" Frobisher said keenly.

"Yes. That was a piece of good luck. And when I did so I removed it.

That was a piece of caution."

"Then you had worked it all out in your mind, I suppose?"

"Yes. I worked it out in the best possible way--backwards. I worked it

out so completely that I was in a position to read another person's

mind. Shall I read that other person's mind?"

Frobisher bowed and smiled in one of his quick grins. Lefroy shifted

uneasily in his chair. Isa Benstein's lips were parted, her arms played

idly by the side of her chair, there was no sign of fear in her eyes.

When she spoke again it was quite calmly and slowly.

"We will begin with the conjurer," she said. "After all, he has

succeeded in forcing the card that is destined to lead up to the

brilliant trick that dazzles and astonishes everybody. We will assume,

for the sake of argument, that you are the conjurer and I am the silly

heedless spectator who is marked out as the involuntary accomplice."

"The mind could not grasp you in that senile capacity," Frobisher

murmured.

"Then give your vivid imagination free run for once, Sir Clement. The

card in this case represents something that you very much desired, call

it the Blue Stone of Ghan. The sacred jewel is hidden in a certain

place. Your great idea is to conjure that somewhere else, and being a

master of your trade, you have to make use of a third party who shall

make the transfer for you without knowing anything of the matter. Only

a prince among conjurers could hope to bring off so brilliant a coup as

that, but there is no great success without great audacity. But Count

Lefroy is looking at his watch. I am afraid that he is not interested."

"It matters nothing about Lefroy," Frobisher said. "I am deeply

interested. Pray go on."

"Of course, our conjurer knows where the stone is. It is in the custody

of an old man who has a young wife. The old man with the young wife has

countless gems for safe custody. From time to time he lends these gems

to his wife to wear, though, with the characteristic caution of his

tribe, he never says anything to the owners. Well, here is the

conjurer's card forced from him, so to speak. All he has to do now is

to design an occasion when the transfer may be made. We will say it is

to be at a brilliant party--a fancy-dress ball, where gems may play a

leading part. The victim will be there. As the Blue Stone of Ghan is a

ruby, he naturally suggests rubies, much as the common conjurer with his

magic bottle induces his assistant on the stage to choose the kind of

liquid he wants to dispense. Says he to himself, that old man will

offer his young wife the Blue Stone as a kind of crown of glory, and she

will take it, not knowing what it is. Once she arrives at the

fancy-dress ball the rest is easy. Do I interest you so far?"

"Wonderfully," Frobisher croaked. "Fancy finding the conjurer out like

that. But though you have spoiled the trick, he must have the forced

card, in this case represented by the--but why complete the phrase?"

"Why, indeed?" Isa Benstein asked serenely. "The brilliant trick as a

brilliant trick has failed, for the simple reason that the involuntary

medium has been too clever for her part. But I see that the conjurer is

not so disconcerted as he might be, because he can always fall back upon

his bully method whereby he sometimes disguises failure and leads up to

a success in a fresh line. Is it to be the bullying policy, Sir

Clement?"

Sir Clement bent forward and nodded eagerly. His yellow teeth were all

exposed in a wide grin. Lefroy sat regarding him with open contempt. A

clock somewhere struck two; the strains of the band floated in.

"I should like to borrow the Blue Stone," Frobisher said hoarsely.

"We will discuss that presently," Isa Benstein went on. "Perhaps I had

better finish my train of logical reasoning. There was danger of the

trick failing, in so much as the Blue Stone might have been recognised.

And here was a further resource open to the conjurer. It was open to

him to put aside the tricks of his trade and take the stone, take it

with violence, if necessary. He would argue that his victim dared not

speak, that she would put up with the loss rather than tell a story that

nobody would believe. The idea of a man robbing his guest with violence

under his own roof--and such a roof!--would be scouted by any

common-sense person. Again, the unconscious medium would have her

husband to consider. If the true facts of the case came out he would be

ruined; there would be a scandal that might end in a gaol. Of course,

when the desired mischief had been worked, the stone would be restored

again, discreetly found before it was lost. Really, gentlemen, my

imagination makes me nervous. As I sit opposite you, I am inwardly

alarmed lest you should fall upon me and despoil me of a thing I would

not have touched had I been aware of the true history of the case. I

know I am foolish----"

"Madame," said Frobisher, rising with a bow. "You cruelly malign

yourself. I have had some experience of clever people, and you are by

far the cleverest woman I have ever met. Your insight is amazing, of

your courage there can be no doubt. But don't carry your courage too

far."

Mrs. Benstein had risen in her turn, the critical moment had come, but

she gave no sign. Frobisher stood also, shaking his head doggedly.

"You deem discretion to be the better part of valour," the woman said.

"The English profess never to know when they are beaten! Surely that is

carrying the thing too far. The man who knows when he is beaten is the

most valorous foe, for the god of war is always on the side of heavy

battalions. You want the stone?"

"I must have it," said Frobisher.

"Must is not a nice word, but----"

"But it's got to be used," Lefroy spoke for the first time. "All these

words are so much air. Will you be so good as to lend us the Blue Stone

for a time, or----"

"Stop!" Mrs. Benstein cried. "Let us quite understand one another. If

I do not lend you the stone you are prepared to go to extreme measures

to get it?"

Frobisher nodded and grinned till his teeth flashed again. He advanced

with his hands outstretched and a look of greed in his eyes. Lefroy

stood by as if apart from the discussion.

"A few more words," Mrs. Benstein said, with a steady smile, "a few more

words, and then you may do as you please. I am forced to allude to the

conjurer again and his forced card. That card is in the possession of

the involuntary medium. The success of the experiment depends upon the

ability of the conjurer to force the card when and how he will. But

suppose the involuntary ally determines to frustrate the trick, and say

that he has lost the card or changed it for another, what then?"

A wicked, brutish oath sprang from Frobisher's lips. All his pretty

cynicism and flippant hardness had gone and the original savage looked

out of his eyes. Just for a moment he panted with a rage that was

unconquerable. He was a murderer in his heart at that moment.

"You mean," he gasped--"you mean to say that you----"

"Precisely. As I said before, I had thought the matter out. Am I the

woman to be any man's puppet? The card has disappeared, the conjurer is

baffled. If you can find the card, well and good; if not, the trick

fails. The card is no longer in my possession."

And Frobisher, looking into her eyes, knew that she spoke the truth.

*CHAPTER XXI.*

*DENVERS LEARNS SOMETHING.*

Frobisher was first to recover himself. There were beads of moisture on

his forehead, his teeth were ground together, but he forced a smile to

his lips. Then he laughed in a low chuckling fashion, as if something

subtle had greatly amused him. Lefroy stood there, glowering.

"I'm not going to be put off like that," he said. "The thing's

impossible."

Isa Benstein ignored the speaker altogether. She was lying back in her

chair as if bored with the whole proceedings. The lights were gleaming

on her jewels and her beautiful, tranquil face.

"Don't lose your head," Frobisher said, still laughing in the same

noiseless way. "Surely you're not so accomplished a liar that you

haven't learned to know the truth when you see it. I pay Mrs. Benstein

the compliment of believing every word that she says. We have exposed

our hands for nothing, and been outwitted by a very clever woman.

You'll gain nothing by losing your temper."

"Who could she have passed the jewel on to?" Lefroy growled.

"Ah, that is the point! Knowing nobody here and all! Madame, I kiss

your hand. You have made Clement Frobisher look and feel like a fool.

It is a sensation I have not experienced since I left school. I believe

every word that you say, nay, if I let myself go I could be furiously

angry with myself. Lefroy, you had better go, there is nothing to be

gained by staying here. After all----"

Frobisher paused, and Mrs. Benstein, with her head serenely tilted

upwards, finished the sentence.

"After all, the Shan of Koordstan is in no better plight than he was

before. Whoever has possession of the stone, it is assuredly not the

Shan."

Lefroy strode off and clanged the door behind him. Frobisher lighted a

fresh cigarette. He had been found out in a singularly rascally action,

but that did not disturb his equanimity in the least.

"You must be having a particularly pleasant evening," he said.

"The most enjoyable I ever remember." Isa Benstein smiled frankly. "In

the first place, I have created a sensation and scored a most decided

success. To a woman that is like a foretaste of Paradise. Then, again,

I have been involuntarily forced to become the central figure of a most

exciting intrigue. I love intrigues and mystery to my finger-tips. I

was to have been the puppet, and yet I have beaten you all along the

line. Oh, yes, I am likely to remember this evening for some time to

come."

"I suppose so," Frobisher grinned. "If I had known I would have lent

you a prize ruby and the Blue Stone might have remained where it was.

If I had made you my ally----"

"Impossible," Isa Benstein said, curtly. "I should never have trusted

you."

Frobisher laughed as if the candour appealed to him.

"I bear no malice," he said. "I love a strong foe. But I wish I had

lent you my big ruby, all the same. You must accept a souvenir of that

kind in memory of this eventful evening. I'll fetch you some uncut

stones from which I shall be proud for you to make your choice.

Meanwhile I shall leave you to admire my orchids. You can't very well

run off with my Cardinal Moth."

"I should like to examine it closer," Isa Benstein said.

It was easily done. Frobisher merely pulled a lever and the framework

upon which the Cardinal Moth was roped came down to within a few feet of

the ground.

Mrs. Benstein caressed the blossoms tenderly. Such a wealth of bloom had

never been seen before. She stood with them all about her like the

goddess Flora, the ropes touched her bare arms, the flowers nodded in

her face.

"I'll not be long," Frobisher croaked as he stooped and touched one of

the shining taps near the floor. "My word, what a picture for an artist

you make!"

He crept away gently, leaving his guest amidst the nodding blooms. They

were so fascinating that Mrs. Benstein could think of nothing else for

the moment. She had quite forgotten the events of the evening. She

turned her lips to a cluster of the glorious blooms.

"They are like beautiful, fascinating snakes," she said to herself. "No

wonder the man dares run the risk of having this bewildering beauty in

his house. Like lovely snakes, the hiss and all complete."

There was a sudden hiss of escaping steam, and the whole of the dropped

trellis-work was enveloped in mist. The mass seemed to move as if it

had been endowed with life or as if a strong breeze had swept over it.

Then without the slightest warning a grip like a vice caught Isa

Benstein below and above the elbow, pressing her forearm and causing her

to wince with the horrible pain.

So tight was the grip that she could not turn or move. She stood there

writhing in agony, and yet too fascinated to call out. The bones

creaked and cracked, and still the pain grew greater; it seemed

impossible that any human fingers could grip flesh and blood like that.

Were all the weird legends clinging round the Cardinal Moth true, Isa

Benstein caught herself wondering in a faint, dizzy way?

Then she braced herself up and struggled violently. It was

characteristic of the woman that she uttered no cry. As she drooped and

her eyes grew cloudy she had a faint vision of a face under a turban,

and then there came a sound of swiftly rushing feet. The platform

seemed to rise with a sudden jerk. Isa Benstein was wrenched from her

feet, the weight of her body told, the arm came away with a cruel drag

from the vice-like grip, and she fell a huddled, shimmering heap on the

floor.

"I hope you are not much hurt," a voice whispered in her ear. "It was

dreadful."

Isa Benstein scrambled to her feet breathless, dizzy, and writhing with

pain. But her quick eyes were clear now, and she recognised the Shan's

companion, whom she knew to be Angela's lover. His face was white and

quivering; there was a nameless horror in his eyes.

"You saw it," Mrs. Benstein said. "What was it?"

"I cannot tell you yet," Harold said. "It was too dreadful, too awful.

The shock of discovery almost unmanned me for a moment. We will speak

about that presently. How did you happen to be just where you stood?"

"I was admiring the flowers. Sir Clement pulled down the frame for me,

so that I could see better. He went away to get something that he

wanted to show me, then there was that sudden grip."

"Which seemed to come out of a vapouring mist, did it not?" Harold asked

hoarsely. "By accident I loosened the spring, and as the frame rose

your weight released you. Is not that so?"

Mrs. Benstein nodded; she had no words just for the moment. Now that

the reaction had come she was feeling sick and faint with the pain.

Harold's eyes were still distended with the horror of some awful

discovery.

"It is very strange," he said. "Sir Clement did not mean to come back

to you, for he has just left the house. He slipped out with some

companion whose face I did not see. But your arm is painful. Nothing

broken, I hope?"

Isa Benstein raised her lovely white arm to prove that such was not the

case. But there was a round red band, and here and there a thin red

stream came from the broken skin.

"Would you mind keeping this to yourself for the present?" Harold asked.

"Believe me, there are urgent reasons why you should do so, reasons so

urgent that I cannot go into them now. If you are silent we shall bring

one of the greatest scoundrels to the gallows. If not----"

"I will be silent," Mrs. Benstein said, between her white set teeth.

"But if you could get me away to see a doctor, or if there is a doctor

here whom I could trust----"

"Of course there is, I must have been a fool not to have thought of it

before. Sir James Brownsmith is the very man, and he is interested in

the case too. Nobody is likely to come in here."

Harold hurried away in search of Brownsmith, whom he had seen a little

while before. He found Angela and explained what he desired to her. He

had hardly got back to the great conservatory before the great surgeon

bustled in. Coolly enough Harold locked the door. There was no chance

of Sir Clement coming back yet. In a few words he gave a brief outline

of what had happened.

"It's part of the mystery," he said. "The same horrible mysterious

force that brought that poor fellow at Streatham and Manfred to their

death."

"Good God!" Sir James cried. "Do you mean to say that you have solved

that mystery?"

"Certainly I have. That is why I wanted you above all men to see Mrs.

Benstein. Oh, never mind who I am for the present. To the world I am

merely Aben Abdullah attached to the suite of the Shan of Koordstan, and

I am popularly supposed to know very little English. Look to your

patient, man."

Sir James passed the rudeness from a young man to one of his exalted

position. Very tenderly and gently he examined the wounded arm. But

his vivid interest was more than strictly professional.

"This is very strange," he said. "There are no bones broken, I am glad

to say--nothing worse than a severe bruise. But I could not believe, I

should utterly refuse to believe that a human hand could make such a

mark like that. Why, it would have to be as large as a shoulder of

mutton to grip the forearm and deltoid like that. Did you see your

assailant, Mrs. Benstein?"

"I saw nothing at all," Mrs. Benstein said, with a faint smile. "There

was nobody to see."

Sir James shook his head, but Harold nodded as if he quite approved of

the remark. Sir James was still carefully examining the round white

arm.

"The thing tallies," he said. "There are the same cruel marks, the same

indentations as from a coarse cloth. And also we have the same great

force used. In the name of God, what is it, sir?"

Brownsmith spoke with a sudden horror upon him. Harold shook his head.

"I can sympathize with your feelings, Sir James," he said. "I came very

near to fainting myself when the full force of the thing dawned upon me.

But for the present I prefer to keep silence. And I will ask you to be

silent also. You would be playing into the hands of an utter scoundrel

if the slightest inkling of Mrs. Benstein's accident were to leak out."

Brownsmith pursed up his lips and nodded.

"Then the best thing Mrs. Benstein can do is to go home," he said.

"Plenty of hot water fomentations for the present and something to

follow. I'll see that it is delivered to-night. But, seeing that Mrs.

Benstein has to say good-night to her hostess, and seeing that her dress

is so low in the sleeves----"

Isa Benstein solved the problem in her own swift, characteristic

fashion. She tore her dress from the shoulder so that the gauzy fabric

hung over and hid the cruel red seam on her arm.

"Ask Lady Frobisher to come here," she said. "Then call my car and fetch

my wraps. I quite see the necessity of making the thing look as natural

as possible."

It was all done so smoothly and easily that no suspicion was aroused.

Mrs. Benstein had simply had an accident with her dress, an accident

that necessitated her immediate return home. She had had a charming

evening, one that she was likely to remember for a long time. Her

manner was easy and natural; she gave no impression of one who has

escaped a nameless horror, perhaps a cruel death.

"I can slip away, thank you very much," she said. "Perhaps the

gentleman who has been so kind will see me to my car. May I ask your

arm?"

Harold bowed profoundly. It was just the opportunity he required. They

threaded their way through the guests along the brilliantly-lighted

corridor into the street where the car was waiting. Isa Benstein held

out her hand in a warm and friendly grip.

"I am going to help you and Miss Lyne, if I can," she said. "Ask Miss

Lyne to come and see me the first thing in the morning. After she has

gone to bed to-night she will know and appreciate my request. Have you

really solved the mystery of the two tragedies?"

"I am absolutely certain of it," Harold replied. "See, there is Sir

Clement and that fellow--Hamid Khan, the man who was in the

smoking-room, you know."

Mrs. Benstein looked eagerly out of the window. Her big eyes gleamed.

"It is as I expected," she said. "I have made a discovery also, Mr.

Denvers. If you will call on me after eleven to-morrow you will hear of

something greatly to your advantage. Strange how fate seems to be

playing into our hands to-night."

The car moved forward, the speaker was gone.

*CHAPTER XXII.*

*STRANDS OF THE ROPE.*

Denvers returned to the ballroom with a feeling that he would be glad to

get away. The whole thing sickened him, the light laughter and frivolous

chatter jarred upon his nerves. He had been very near to a dreadful

tragedy; he had learnt a hideous truth, and he had not got himself in

hand yet. He wanted to know the whole truth without delay. Angela

awaited him anxiously.

"My aunt tells me that Mrs. Benstein is gone," she said. "She had an

accident with her dress. Harold, you look as if you had seen a ghost."

"I have seen the devil, which is much the same thing," Harold murmured.

"My dear girl, never again shall I flatter myself that I have no nerves.

I dare not go into the refreshment-room and demand strong drink, but I

shall be more than grateful if you will smuggle me a glass of champagne

into the little alcove where we first met to-night. There I can tell

you something."

But it was not very much that Harold had to tell. The terrible

discovery he had made must be kept to himself as far as Angela was

concerned. Mrs. Benstein would like to see Angela in the morning. She

had a new design for a costume that might suit the girl, so that she was

to be sure and wear the blue orchids that Angela had at present in her

hair.

"It sounds very mysterious," Angela smiled.

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