"If he had been one there was no reason to believe that he
had ceased to be. On the contrary, from his point of view,
any sudden chance would be likely to draw attention to
himself. He would, probably, for a time at least, continue
to perform his duties. There was no reason to suppose that
he was going under an assumed name. Why should he change his
name in a country where no one knew his original one? I
therefore organized my Street Arab detective corps, and sent
them systematically to every cab proprietor in London until
they ferreted out the man that I wanted. How well they
succeeded, and how quickly I took advantage of it, are still
fresh in your recollection. The murder of Stangerson was an
incident which was entirely unexpected, but which could
hardly in any case have been prevented. Through it, as you
know, I came into possession of the pills, the existence of
which I had already surmised. You see the whole thing is a
chain of logical sequences without a break or flaw."

"It is wonderful!" I cried. "Your merits should be publicly
recognized. You should publish an account of the case.
If you won't, I will for you."

"You may do what you like, Doctor," he answered. "See here!"
he continued, handing a paper over to me, "look at this!"

It was the _Echo_ for the day, and the paragraph to which he
pointed was devoted to the case in question.

"The public," it said, "have lost a sensational treat through
the sudden death of the man Hope, who was suspected of the