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 eliminated all the servants from the case. Therefore, proceed, Knox, I am all attention.”

“I will do so. There is a door on the south side of the house, close to the tower and opening into the rhododendron shrubbery. This was the door used by Colonel Menendez in his somnambulistic rambles, according to his own account. Now, assuming his statement to have been untrue in one particular, that is, assuming he was not walking in his sleep, but was fully awake”

“Eh?” exclaimed Harley, his expression undergoing a subtle change. “Do you think his statement was untrue?”

“According to my theory, Harley, his statement was untrue, in this particular, at least. But to proceed: Might he not have employed this door to admit a nocturnal visitor?”

“It is feasible,” muttered Harley, watching me closely.

“For the Colonel to descend to this side door when the household was sleeping,” I continued, “and to admit a woman secretly to Cray’s Folly, would have been a simple matter. Indeed, on the occasions of these visits he might even have unbolted the door himself after Pedro had bolted it, in order to enable her to enter without his descending for the purpose of admitting her.”

“By heavens! Knox,” said Harley, “I believe you have it!”

His eyes were gleaming excitedly, and I proceeded:

“Hence the footsteps which passed Miss Beverley’s door, hence the shadow which you saw upon the blind; and the sounds which you detected in the hall were caused, of course, by this woman retiring. It was the