Section 6, The Man with the Twisted Lip Summary

The story begins with a description of Isa Whitney, husband to Kate Whitney, one of Watson's wife's friends and of his addiction to opium. One night just as Watson and his wife are sitting down to respectively read and knit after dinner, Kate Whitney comes to their door. She is panicked because her husband has been missing for several days, presumably at an opium den in London. She implores Watson to travel to the opium den and retrieve her husband. Despite the hour and the unpleasantness of the business, Watson duly goes onto London's underbelly to try and find Isa Whitney. He quickly finds the addict lying about in the opium den.

Isa is unaware that he has been gone for so long and asks Watson to pay his opium bill...