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turned livid with mingled fear and rage. He stalked up to Thorndyke with a threatening air, but, suddenly altering his mind, exclaimed, "I must see to this!" and flung out of the room.

      Thorndyke took a key from his pocket, and, having locked the door, turned to the closet. Having taken out the key to unhamper the lock with a stout wire, he reinserted it and unlocked the door. As we entered, we found ourselves in a narrow closet, similar to the one in the other room, but darker, owing to the absence of a mirror. A few clothes hung from the pegs, and when Thorndyke had lit a candle that stood on a shelf, we could see more of the details.

      "Here are some of the properties," said Thorndyke. He pointed to a peg from which hung a long, blue silk gown of Chinese make, a mandarin's cap, with a pigtail attached to it, and a beautifully-made papier-màché mask. "Observe," said Thorndyke, taking the latter down and exhibiting a label on the inside, marked "Renouard à Paris," "no trouble has been spared."

      He took off his coat, slipped on the gown, the mask, and the cap, and was, in a moment, in that dim light, transformed into the perfect semblance of a Chinaman.

      "By taking a little more time," he remarked, pointing to a pair of Chinese shoes and a large paper lantern, "the make-up could be rendered more complete; but this seems to have answered for our friend Alfred."

      "But," said Mr. Brodribb, as Thorndyke shed the disguise, "still, I don't understand—"

      "I will make it clear to you in a moment," said Thorndyke. He walked to the end of the closet, and, tapping the right-hand wall, said: "This is the back of the mirror. You see that it is hung on massive well-oiled hinges, and is supported on this large, rubber-tyred castor, which evidently has ball bearings. You observe three black cords running along the wall, and passing through those pulleys above. Now, when I pull this cord, notice what happens."

      He pulled one cord firmly, and immediately the mirror swung noiselessly inwards on its great castor, until it stood diagonally across the closet, where it was stopped by a rubber buffer.

      "Bless my soul!" exclaimed Mr. Brodribb. "What an extraordinary thing!"

      The effect was certainly very strange, for, the mirror being now exactly diagonal to the two closets they appeared to be a single, continuous passage, with a door at either end. On going up to the mirror, we found that the opening which it had occupied was filled by a sheet of plain glass, evidently placed there as a precaution to prevent any person from walking through from one closet into the other, and so discovering the trick.

      "It's all very puzzling," said Mr. Brodribb; "I don't clearly understand it now."

      "Let us finish here," replied Thorndyke, "and then I will explain. Notice this black curtain. When I pull the second cord, it slides across the closet and cuts off the light. The mirror now reflects nothing into the other closet; it simply appears dark. And now I pull the third cord."

      He did so, and the mirror swung noiselessly back into its place.

      "There is only one other thing to observe before we go out," said Thorndyke, "and that is this other mirror standing with its face to the wall. This, of course, is the one that Fred Calverley originally saw at the end of the closet; it has since been removed, and the larger swinging glass put in its place. And now," he continued, when we came out into the room, "let me explain the mechanism in detail. It was obvious to me, when I heard poor Fred Calverley's story, that the mirror was 'faked,' and I drew a diagram of the probable arrangement, which turns out to be correct. Here it is." He took a sheet of paper from his pocket and handed it to the lawyer. "There are two sketches. Sketch 1 shows the mirror in its ordinary position, closing the end of the closet. A person standing at A, of course, sees his reflection facing him at, apparently, A 1. Sketch 2 shows the mirror swung across. Now a person standing at A does not see his own reflection at all; but if some other person is standing in the other closet at B, A sees the reflection of B apparently at B 1—that is, in the identical position that his own reflection occupied when the mirror was straight across."

      "I see now," said Brodribb; "but who set up this apparatus, and why was it done?"

      "Let me ask you a question," said Thorndyke. "Is Alfred Calverley the next-of-kin?"

      "No; there is Fred's younger brother. But I may say that Fred has made a will quite recently very much in Alfred's favour."

      "There is the explanation, then," said Thorndyke. "These two scoundrels have conspired to drive the poor fellow to suicide, and Raggerton was clearly the leading spirit. He was evidently concocting some story with which to work on poor Fred's superstitions when the mention of the Chinaman on the steamer gave him his cue. He then invented the very picturesque story of the murdered mandarin and the stolen pearl. You remember that these 'visitations' did not begin until after that story had been told, and Fred had been absent from the house on a visit. Evidently, during his absence, Raggerton took down the original mirror, and substituted this swinging arrangement; and at the same time procured the Chinaman's dress and mask from the theatrical property dealers. No doubt he reckoned on being able quietly to remove the swinging glass and other properties and replace the original mirror before the inquest."

      "By God!" exclaimed Mr. Brodribb, "it's the most infamous, cowardly plot I have ever heard of. They shall go to gaol for it, the villains, as sure as I am alive."

      But in this Mr. Brodribb was mistaken; for immediately on finding themselves detected, the two conspirators had left the house, and by nightfall were safely across the Channel; and the only satisfaction that the lawyer obtained was the setting aside of the will on facts disclosed at the inquest.

      As to Thorndyke, he has never to this day forgiven himself for having allowed Fred Calverley to go home to his death.

      The Aluminium Dagger

       Table of Contents

      The "urgent call"—the instant, peremptory summons to professional duty—is an experience that appertains to the medical rather than the legal practitioner, and I had supposed, when I abandoned the clinical side of my profession in favour of the forensic, that henceforth I should know it no more; that the interrupted meal, the broken leisure, and the jangle of the night-bell, were things of the past; but in practice it was otherwise. The medical jurist is, so to speak, on the borderland of the two professions, and exposed to the vicissitudes of each calling, and so it happened from time to time that the professional services of my colleague or myself were demanded at a moment's notice. And thus it was in the case that I am about to relate.

      The sacred rite of the "tub" had been duly performed, and the freshly-dried person of the present narrator was about to be insinuated into the first instalment of clothing, when a hurried step was heard upon the stair, and the voice of our laboratory assistant, Polton, arose at my colleague's door.

      "There's a gentleman downstairs, sir, who says he must see you instantly on most urgent business. He seems to be in a rare twitter, sir—"

      Polton was proceeding to descriptive particulars, when a second and more hurried step became audible, and a strange voice addressed Thorndyke.

      "I have come to beg your immediate assistance, sir; a most dreadful thing has happened. A horrible murder has been committed. Can you come with me now?"

      "I will be with you almost immediately," said Thorndyke. "Is the victim quite dead?"

      "Quite. Cold and stiff. The police think—"

      "Do the police know that you have come for me?" interrupted Thorndyke.

      "Yes. Nothing is to be done until you arrive."

      "Very well. I will be ready in a few minutes."

      "And if you would wait downstairs, sir," Polton added persuasively, "I could help the doctor to get ready."

      With this crafty appeal, he lured the intruder back to the sitting-room, and shortly after stole softly up the stairs with a small breakfast tray, the contents of which he deposited firmly in our respective rooms, with a few timely words on the

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