“Well, I felt pretty sure about that, and I wanted an explanation of it. Why had Mark changed down there instead of in his bedroom? The only answer was that the fact of his changing had to be kept secret. When did he change? The only possible time was between lunch (when he would be seen by the servants) and the moment of Robert’s arrival. And when did Cayley collect the clothes in a bundle? Again, the only answer was ‘Before Robert’s arrival.’ So another x was wanted—to fit those three conditions.” “And the answer was that a murder was intended, even before Robert arrived?” “Yes. Well now, it couldn’t be intended on the strength of that letter, unless there was very much more behind the letter than we knew. Nor was it possible a murder could be intended without any more preparation than the changing into a different suit in which to escape. The thing was too childish. Also, if Robert was to be murdered, why go out of the way to announce his existence to you all—even, at the cost of some trouble, to Mrs. Norbury? What did it all mean? I didn’t know. But I began to feel now that Robert was an incident only; that the plot was a plot of Cayley’s against Mark—either to get him to kill his brother, or to get his brother to kill him—and that for some inexplicable reason Mark seemed to be lending himself to the plot.” He was silent for a little, and then said, almost to himself, “I had seen the empty brandy bottles in that cupboard.” “You never said anything about them,” complained Bill. “I only saw them afterwards. I was looking for the collar, you remember. They came back to me afterwards; I knew how Cayley would feel about it.... Poor devil!” “Go on,” said Bill. “Well, then, we had the inquest, and of course I noticed, and I suppose you did too, the curious fact that Robert had asked his way at the second lodge and not at the first. So I talked to Amos and Parsons. That made it more curious. Amos told me that Robert had gone out of his way to speak to him; had called to him, in fact. Parsons told me that his wife was out in their little garden at the first lodge all the afternoon, and was certain that Robert had never come past it. He also told me that Cayley had put him on to a job on the front lawn that afternoon. So I had another guess. Robert had used the secret passage—the passage which comes out into the park between the first and second lodges. Robert, then, had been in the house; it was a put-up job between Robert and Cayley. But how could Robert be there without Mark knowing? Obviously, Mark knew too. What did it all mean?” “When was this?” interrupted Bill. “Just after the inquest—after you’d seen Amos and Parsons, of course?”