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 “I am sorry that he has seen you.”

“And so was I at first. But there was no getting out of it.”

“What effect do you think it will have upon his plans, now that he knows you are here?”

“It may cause him to be more cautious, or it may drive him to desperate measures at once. Like most clever criminals, he may be too confident in his own cleverness and imagine that he has completely deceived us.”

“Why should we not arrest him at once?”

“My dear Watson, you were born to be a man of action. Your instinct is always to do something energetic. But supposing, for argument’s sake, that we had him arrested to-night, what on earth the better off should we be for that? We could prove nothing against him. There’s the devilish cunning of it! If he were acting through a human agent we could get some evidence, but if we were to drag this great dog to the light of