When Dr John Watson takes rooms in Baker Street with amateur detective Sherlock Holmes, he has no idea that he is about to enter a shadowy world of criminality and violence. Accompanying Holmes to an ill-omened house in south London, Watson is startled to find a dead man whose face is contorted in a rictus of horror. There is no mark of violence on the body yet a single word is written on the wall in blood. Dr Watson is as baffled as the police, but Holmes's brilliant analytical skills soon uncover a trail of murder, revenge and lost love ...

The Sign of the Four

by Arthur Conan Doyle

Published 1 January 1993
When a young lady approaches Sherlock Holmes looking for help in finding out what happened to her father when he disappeared 10 years earlier, both Holmes and Watson are sent on a mission involving stolen treasure, service in colonial India and a secret pact among four ex-convicts.