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 be safely trusted to do, for although he is absolutely devoid of reason, he is as tenacious as a bull-dog when he once understands what he has to do, and indeed, it is just this tenacity which has brought him to the top at Scotland Yard.”

“Your case is not complete, then?” I asked.

“It is fairly complete in essentials. We know who the author of the revolting business is, although one of the victims still escapes us. Of course, you have formed your own conclusions.”

“I presume that this Jim Browner, the steward of a Liverpool boat, is the man whom you suspect?”

“Oh! it is more than a suspicion.”

“And yet I cannot see anything save very vague indications.”

“On the contrary, to my mind nothing could be more clear. Let me run over the principal steps. We approached the case, you remember, with an absolutely blank mind, which is always an advantage. We had formed no theories. We were simply there to observe and to draw inferences from our observations. What did we see first? A very placid and respectable lady, who seemed quite innocent of any secret, and a portrait which showed me that she had two younger sisters. It instantly flashed across my mind that the box might have been meant for one of these. I set the idea aside as one which could be dis-