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found suggested at once that it had been torn from the costume of the murderer. I dismissed Pierrette from my mind (since it takes considerable strength to drive a table-knife home) and fixed upon Pierrot as the criminal. But Pierrot left the ball nearly two hours before the murder was committed. So he must either have returned to the ball later to kill Lord Cronshaw, or— eh bien , he must have killed him before he left! Was that impossible? Who had seen Lord Cronshaw after supper that evening? Only Mrs. Davidson, whose statement, I suspected, was a deliberate fabrication uttered with the object of accounting for the missing pompon, which, of course, she cut from her own dress to replace the one missing on her husband’s costume. But then, Harlequin, who was seen in the box at one-thirty, must have been an impersonation. For a moment, earlier, I had considered the possibility of Mr. Beltane being the guilty party. But with his elaborate costume, it was clearly impossible that he could have doubled the roles of Punchinello and Harlequin. On the other hand, to Davidson, a young man of about the same height as the murdered man and an actor by profession, the thing was simplicity itself.
    “But one thing worried me. Surely a doctor could not fail to perceive the difference between a man who had been dead two hours and one who had been dead ten minutes! Eh bien , the doctor did perceive it! But he was not taken to the body and asked, ‘How long has this man been dead?’ On the contrary, he was informed that the man had been seen alive ten minutes ago, and so he merely commented at the inquest on the abnormal stiffening of the limbs for which he was quite unable to account!
    “All was now marching famously for my theory. Davidson had killed Lord Cronshaw immediately after supper, when, as you remember, he was seen to draw him back into the supper-room. Then he departed with Miss Courtenay, left her at the door of her flat (instead of going in and trying to pacify her as he affirmed) and returned post-haste to the Colossus—but as Harlequin, not Pierrot—a simple transformation effected by removing his outer costume.”
    The uncle of the dead man leaned forward, his eyes perplexed.
    “But if so, he must have come to the ball prepared to kill his victim. What earthly motive could he have had? The motive, that’s what I can’t get.”
    “Ah! There we come to the second tragedy—that of Miss Courtenay. There was one simple point which everyone overlooked. Miss Courtenay died of cocaine poisoning—but her supply of the drug was in the enamel box which was found on Lord Cronshaw’s body. Where, then, did she obtain the dose which killed her? Only one person could have supplied her with it—Davidson. And that explains everything. It accounts for her friendship with the Davidsons and her demand that Davidson should escort her home. Lord Cronshaw, who was almost fanatically opposed to drug-taking, discovered that she was addicted to cocaine, and suspected that Davidson supplied her with it. Davidson doubtless denied this, but Lord Cronshaw determined to get the truth from Miss Courtenay at the ball. He could forgive the wretched girl, but he would certainly have no mercy on the man who made a living by trafficking in drugs. Exposure and ruin confronted Davidson. He went to the ball determined that Cronshaw’s silence must be obtained at any cost.”
    “Was Coco’s death an accident, then?”
    “I suspect that it was an accident cleverly engineered by Davidson.
    She was furiously angry with Cronshaw, first for his reproaches, and secondly for taking her cocaine from her. Davidson supplied her with more, and probably suggested her augmenting the dose as a defiance to ‘old Cronch’!”
    “One other thing,” I said. “The recess and the curtain? How did you know about them?”
    “Why, mon ami , that was the most simple of all. Waiters had been in and out of that little room, so, obviously, the body could not have been