least she says she did. But if he was there, he came out again by the door."
"Well, but where does that lead you?"
"Where it led Mark. The passage."
"Do you mean that he's been hiding there all the time?" Antony was silent until Bill had repeated his question, and then with an effort he came out of his thoughts and answered him.
"I don't know. But look here. Here is a possible explanation. I don't know if it is the right one—I don't know, Bill; I'm rather frightened. Frightened of what may have happened, of what may be going to happen. However, here is an explanation. See if you can find any fault with it."
With his legs stretched out and his hands deep in his pockets, he lay back on the garden-seat, looking up to the blue summer sky above him, and just as if he saw up there the events of yesterday being enacted over again, he described them slowly to Bill as they happened.
"We'll begin at the moment when Mark shoots Robert. Call it an accident; probably it was. Mark would say it was, anyhow. He is in a panic, naturally. But he doesn't lock the door and run away. For one thing, the key is on the outside of the door; for another, he is not quite such a fool as that. But he is in a horrible position. He is known to be on bad terms with his brother; he has just uttered some foolish threat to him, which may possibly have been
