"The Man with the Twisted Lip", one of the 56 short Sherlock Holmes stories written by British author Sir Arthur Conan Doyle, is the sixth of the twelve stories in The Adventures of Sherlock Holmes. The story was first published in the Strand Magazine in December 1891. Doyle ranked "The Man with the Twisted Lip'' sixteenth in a list of his nineteen favourite Sherlock Holmes stories.
Late at night, Kate Whitney, a friend of Dr. Watson's wife, calls on them. Her husband Isa has been absent for several days. Frantic with worry, she begs Dr. Watson to fetch him home from the opium den where he goes. Watson does this, but he also finds his friend Sherlock Holmes in the den, disguised as an old man, seeking for clues among the habitués of the place...