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Rh deserted hall. He slowly mounted the stairs and I followed him into his room. It was now quite light, and as my friend dropped down upon the bed I thought that he looked very tired and haggard.

“Knox,” he said, “shut the door.”

I closed the door and turned to him.

“You heard that question about Miss Beverley?” I began.

“I heard it, and I am wondering what her answer will be when the Inspector puts it to her personally.”

“Surely it is obvious?” I cried. “A cloud of apprehension had settled on the house last night, Harley, which was like the darkness of Egypt. The poor girl was afraid to go to bed. She was probably sitting up reading.”

“Hm,” said Harley, drumming his feet upon the carpet. “Of course you realize that there is one person in Cray’s Folly who holds the clue to the heart of the mystery?”

“Madame de Stämer?”

He nodded grimly.

“When the rifle cracked out, Knox, she knew! Remember, no one had told her the truth. Yet can you doubt that she knows?”

“I don’t doubt it.”

“Neither do I.” He clenched his teeth tightly and beat his fists upon the coverlet. “I was dreading that our friend the Inspector would ask a question which to my mind was very obvious.”

“You mean?”

“Well, what investigator whose skull contained anything more useful than bubbles would have failed to ask if Colonel Menendez had an enemy in the neighbourhood?”