The Valley of Fear

A coded message arrives at Baker Street, warning of a murder that has already taken place in a moated country manor. The investigation leads Holmes to uncover a secret society and a history of violence in the coal mining districts of America. The narrative structure splits between the deductive puzzle in England and the gritty backstory of the "Scowrers" across the Atlantic. It is a grim and compelling tale that demonstrates the long reach of organized crime and the persistence of vengeance.