VI The Man with the Twisted Lip [UNABRIDGED AUDIOBOOK WITH TEXT]

After rescuing a friend's husband from an East End opium den, Dr. Watson rather improbably finds his friend Sherlock Holmes there, disguised as an old man apparently trying to extract information from the addicts in the den.

Mr. Neville St. Clair, a respectable and punctual country businessman, has disappeared. Making the matter even more mysterious is that Mrs. St. Clair is quite sure that she saw her husband at a second-floor window in a rather rough part of town near the docks. He withdrew into the window immediately, and Mrs. St. Clair is quite sure that there was something very wrong...