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Rh Poirot shook his head, and then caught my arm.

“The clock, Hastings, look at the clock.”

I followed his gaze to the mantelpiece. The clock had stopped at four o’clock.

“Mon ami, some one has tampered with it. It had still three days to run. It is an eight-day clock, you comprehend?”

“But what should they want to do that for? Some idea of a false scent by making the crime appear to have taken place at four o’clock?”

“No, no; rearrange your ideas, mon ami. Exercise your little gray cells. You are Mayerling. You hear something, perhaps—and you know well enough that your doom is sealed. You have just time to leave a sign. Four o’clock, Hastings. Number Four, the destroyer. Ah! an idea!”

He rushed into the other room and seized the telephone. He asked for Hanwell.

“You are the Asylum, yes? I understand there has been an escape to-day? What is that you say? A little moment, if you please. Will you repeat that? Ah! parfaitement.”

He hung up the receiver, and turned to me.

“You heard, Hastings? There has been no escape.”

“But the man who came—the keeper?” I said.