. Likely or not likely, we
know he did do it."

"Of course he did. All I mean is that he must have had some strong
reason for telling Mrs. Norbury at once. And the reason I suggest is
that he knew on that morning--Monday morning, not Tuesday--that Robert
was coming to see him, and had to be in first with the news.

"But--but--"

"And that would explain the other point--his instantaneous decision at
breakfast to tell you all about his brother. It wasn't instantaneous. He
knew on Monday that Robert was coming, and decided then that you would
all have to know."

"Then how do you explain the letter?"

"Well, let's have a look at it."

Antony took the letter from his pocket and spread it out on the grass
between them.

"Mark, your loving brother is coming to see you to-morrow, all the way
from Australia. I give you warning, so that you will be able to conceal
your surprise but not I hope your pleasure. Expect him at three or
thereabouts."

"No date mentioned, you see," said Antony. "Just to-morrow."

"But he got this on Tuesday."

"Did he?"

"Well, he read it out to us on Tuesday."

"Oh, yes! he read it out to you."

Bill read the letter again, and then turned it over and looked at the
back of it. The back of it had nothing to say to him.

"What about the postmark?" he asked.

"We haven't got the envelope, unfortunately."

"And you think that he got this letter on Monday."

"I'm inclined to think so, Bill. Anyhow, I think--I feel almost
certain--that he knew on Monday that his brother was coming."

"Is that going to help us much?"

"No. It makes it more difficult. There's something rather uncanny about
it all. I don't understand it." He was silent for a little, and then
added, "I wonder if the inquest is going to help us.

"What about last night? I'm longing to hear what you make of that. Have
you been thinking it out at all?"

"Last night," said Antony thoughtfully to himself. "Yes, last night
wants some explaining."

Bill waited hopefully for him to explain. What, for instance, had Antony
been looking for in the cupboard?

"I think," began Antony slowly, "that after last night we must give up
the idea that Mark has been killed; killed, I mean, by Cayley. I don't
believe anybody would go to so much trouble to hide a suit of clothes
when he had a body on his hands. The body would seem so much more
important. I think we may take it now that the clothes are all that
Cayley had to hide."

"But