In Sir Arthur Conan Doyle's final Sherlock Holmes novel, the brilliant detective is drawn into a baffling case. A cryptic message leads Holmes and Watson to a moated manor house where a man has been brutally murdered. The investigation uncovers a complex web of intrigue, secret societies, and a violent past stretching back to America's coal-mining valleys. Holmes must unravel a history of fear and vengeance to solve the present-day crime and expose the truth behind the mysterious 'Valley of Fear'.