I don't suppose there's anything to find in the cupboard, but I
feel that we must look."

"Do you still think Mark's body might be there?"

"No. And yet where else can it be? Unless I'm hopelessly wrong,
and Cayley never killed him at all."

Bill hesitated, wondering if he dare advance his theory.

"I know you'll think me an ass--"

"My dear Bill, I'm such an obvious ass myself that I should be
delighted to think you are too."

"Well, then, suppose Mark did kill Robert, and Cayley helped him
to escape, just as we thought at first. I know you proved
afterwards that it was impossible, but suppose it happened in a
way we don't know about and for reasons we don't know about. I
mean, there are such a lot of funny things about the whole show
that--well, almost anything might have happened."

"You're quite right. Well?"

"Well, then, this clothes business. Doesn't that seem rather to
bear out the escaping theory? Mark's brown suit was known to the
police. Couldn't Cayley have brought him another one in the
passage, to escape in, and then have had the brown one on his
hands? And thought it safest to hide it in the pond?"