future. If Mark had shot his brother immediately afterwards it must have been an accident, the result of a struggle, say, provoked by that "nasty-like" tone of voice. Nobody would say "You wait" to a man who was just going to be shot. "You wait" meant "You wait, and see what's going to happen to you later on." The owner of the Red House had had enough of his brother's sponging, his brother's blackmail; now it was Mark's turn to get a bit of his own back. Let Robert just wait a bit, and he would see. The conversation which Elsie had overheard might have meant something like this. It couldn't have meant murder. Anyway not murder of Robert by Mark.
"It's a funny business," thought Antony. "The one obvious solution is so easy and yet so wrong. And I've got a hundred things in my head, and I can't fit them together. And this afternoon will make a hundred and one. I mustn't forget this afternoon."
He found Bill in the hall and proposed a stroll. Bill was only too ready. "Where do you want to go?" he asked.
"I don't mind much. Show me the park."
"Righto."
They walked out together.
"Watson, old man," said Antony, as soon as they were away from the house, "you really mustn't talk so loudly indoors. There was a gentleman outside, just behind you, all the time."
