Is a man in Mark's state of mind,
frightened to death lest he should be found with the body, going
to do anything so foolhardy as that?"
"He needn't have been afraid of me," said Cayley.
"Then why didn't he call for you? He knew you were about. You
could have advised him; Heaven knows he wanted advice. But the
whole theory of Mark's escape is that he was afraid of you and of
everybody else, and that he had no other idea but to get out of
the room himself, and prevent you or the servants from coming
into it. If the key had been on the inside, he would probably
have locked the door. If it were on the outside, he almost
certainly wouldn't."
"Yes, I expect you're right," said Bill thoughtfully. "Unless he
took the key in with him, and locked the door at once."
"Exactly. But in that case you have to build up a new theory
entirely."
"You mean that it makes it seem more deliberate?"
"Yes; that, certainly. But it also seems to make Mark out an
absolute idiot. Just suppose for a moment that, for urgent
reasons which neither of you know anything about, he had wished
to get rid of his brother.
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