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Chan was instantly on the floor. “There is no glass beneath,” he said.

“No, no,” Tarneverro continued. “There wouldn’t be. The broken glass was naturally found where Miss Fane fell. And why? Because this unknown person removed the watch with a handkerchief, as you have done; he swung it against the table in that handkerchief to catch the bits of crystal, and carried the wrecked remains intact to the spot where he wanted them. A bright boy, Inspector.”

Charlie nodded. Obvious chagrin was in his manner. “But you are brighter boy. Almost I am on verge of resigning in disgust at my own stupidity. You should take my badge, Mr. Tarneverro, for you are the smart detective on this case.”

Tarneverro gave him an odd look. “You think so, do you? I’m afraid you exaggerate—the matter was really simple enough. It came into my mind that too many of us had alibis in this affair. I thought how easy it would be to change the time on the face of a watch. That is what happened here. The murderer set it at a moment then past, for which he had already established an alibi—or at a future time for which he proposed to get an alibi forthwith. However, when a man is excited he is likely to slip up somewhere—and this chap stumbled when he forgot to push down that little stem before he left.”

Chan sighed. “I am, as I remarked, bubbling with gratitude toward you, and yet I am appalled. Whole flock of alibis is now quite ruined, and the field broadens like some boundless prairie. Van Horn’s alibi is gone, the alibis of Martino and of Jaynes, they are gone too, and—begging humble pardon, Mr. Tar-