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Rh Whitney's bill, led him out to the cab, and seen him driven through the darkness. In a very short time a decrepit figure had emerged from the opium den, and I was walking down the street with Sherlock Holmes. For two streets he shuffled along with a bent back and an uncertain foot. Then, glancing quickly round, he straightened himself out and burst into a hearty fit of laughter.

"I suppose, Watson," said he, "that you imagine that I have added opium-smoking to cocaine injections, and all the other little weaknesses on which you have favored me with your medical views."

"I was certainly surprised to find you there."

"But not more so than I to find you."

"I came to find a friend."

"And I to find an enemy."

"An enemy?"

"Yes; one of my natural enemies, or, shall I say, my natural prey. Briefly, Watson, I am in the midst of a very remarkable inquiry, and I have hoped to find a clew in the incoherent ramblings of these sots, as I have done before now. Had I been recognized in that den my life would not have been worth an hour's purchase; for I have used it before now for my own purposes, and the rascally Lascar who runs it has sworn to have vengeance upon me. There is a trap-door at the back of that building, near the corner of Paul's Wharf, which could tell some strange tales of what has passed through it upon the moonless nights."

"What! You do not mean bodies?"

"Aye, bodies, Watson. We should be rich men if we had £1000 for every poor devil who has been done to death in that den. It is the vilest murder-trap on the whole river-side, and I fear that Neville St. Clair has entered it never to leave it more. But our trap should be here." He put his two forefingers between his teeth and whistled shrilly—a signal which was answered by a similar whistle from the distance, followed shortly by the rattle of wheels and the clink of horses' hoofs.