Page:Milne - The Red House Mystery (Dutton, 1922).djvu/47

Rh stretch of park beyond; and he felt very sorry for the owner of it all, who was now mixed up in so grim a business.

"Cayley thinks he did it," said Antony to himself. "That's obvious. It explains why he wasted so much time banging on the door. Why should he try to break a lock when it's so much easier to break a window? Of course he might just have lost his head; on the other hand, he might—well, he might have wanted to give his cousin a chance of getting away. The same about the police, and—oh, lots of things. Why, for instance, did we run all the way round the house in order to get to the windows? Surely there's a back way out through the hall. I must have a look later on."

Antony, it will be observed, had by no means lost his head.

There was a step in the passage outside, and he turned round, to see Cayley in the doorway. He remained looking at him for a moment, asking himself a question. It was rather a curious question. He was asking himself why the door was open.

Well, not exactly why the door was open; that could be explained easily enough. But why had he expected the door to be shut? He did not remember shutting it, but somehow he was surprised to see it open now, to see Cayley through the doorway, just coming into the room. Something working sub-consciously in his brain had told him that it was surprising. Why?