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 have neither the energy nor the means to make proper inquiries; and, in short, when you're doing the whole thing in a thoroughly amateur, haphazard way."

"For amateurs I don't think we're doing at all badly," protested Bill.

"No; not for amateurs. But if we had been professionals, I believe we should have gone at it from the other end. The Robert end. We've been wondering about Mark and Cayley all the time. Now let's wonder about Robert for a bit."

"We know so little about him."

"Well, let's see what we do know. First of all, then, we know vaguely that he was a bad lot—the sort of brother who is hushed up in front of other people."

"Yes."

"We know that he announced his approaching arrival to Mark in a rather unpleasant letter, which I have in my pocket."

"Yes."

"And then we know rather a curious thing. We know that Mark told you all that this black sheep was coming. Now, why did he tell you?"

Bill was thoughtful for a moment.

"I suppose," he said slowly, "that he knew we were bound to see him, and thought that the best way was to be quite frank about him."

"But were you bound to see him? You were all away playing golf."

"We were bound to see him if he stayed in the house that night."