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cially the photograph; he guessed from our talk that it must be Miss Rendall-Smith's, and knew that it was likely to direct attention to her. He did not hope to steal it, because the loss would be too obvious, but he could not resist putting his arm through the sliding panel while we were playing Bridge and just taking a look at it. He had himself a photograph of Miss Rendall-Smith in his pocket, taken at the same sitting: when he first heard us talking about photographs, he pulled this out to make sure he had not lost it; and when he had the second photograph in his hands he switched on his electric torch for an instant (a risky thing to do) and compared them. Then, in the dark, he put back the wrong one by mistake.

Why he was so anxious to get back the copy of the cipher, he did not explain. I fancy when he first contemplated the idea he imagined that we had the original; and to that, as we shall see, he did attach importance. But he did not think he took much risk when he purloined the cipher and put it back again on finding it useless, or when he came out at night to see what souvenirs of Brotherhood Reeves had got. I think he was afraid of some fresh clue which might inculpate Miss Rendall-Smith; and he imagined, of course, that the watch at the door was the only thing he had to be frightened of.

It was only next morning that he found some of my chewing gum on his trousers, and guessed that a trap had been laid for him. As soon as he heard our movements upstairs he stepped out into the