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 “There go two of my threads, Watson. There is nothing more stimulating than a case where everything goes against you. We must cast round for another scent.”

“We have still the cabman who drove the spy.”

“Exactly. I had wired to get his name and address from the Official Registry. I should not be surprised if this were an answer to my question.”

The ring at the bell proved to be something even more satisfactory than an answer, however, for the door opened and a rough-looking fellow entered who was evidently the man himself.

“I got a message from the head office that a gent at this address had been inquiring for 2704,” said he. “I’ve driven my cab this seven years and never a word of complaint. I came here straight from the Yard to ask you to your face what you had against me.”

“I have nothing in the world against you, my good man,” said Holmes. “On the contrary, I have half a sovereign for you