“That is the name,” he said. “You cannot effect an arrest until tomorrow night at the earliest. I should prefer that you do not mention my name at all in connection with the case, as I choose to be only associated with those crimes which present some difficulty in their solution. Come on, Watson.” We strode off together to the station, leaving Lestrade still staring with a delighted face at the card which Holmes had thrown him.

“The case,” said Sherlock Holmes as we chatted over our cigars that night in our rooms at Baker Street, “is one where, as in the investigations which you have chronicled under the names of ‘A Study in Scarlet’ and of ‘The Sign of Four,’ we have been compelled to reason backward from effects to causes. I have written to Lestrade asking him to supply us with the details which are now wanting, and which he will only get after he had secured his man. That he may be safely trusted to do, for although he is absolutely devoid of reason, he is as tenacious as a bulldog 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.