Dr. John H. Watson could not anticipate that a favour for the noted American mystery writer and forensic dentist, Rodrigues Ottolengui, would result in the discovery of a heinous murder. But that is what happens when in helping the American, Watson finds himself at a shooting match in a London villa that ultimately leads him to a charred corpse lying face down in a fireplace. With the members of a shooters club as suspects, Watson and Scotland Yard are quick to welcome Sherlock Holmes to the investigation. Relying on Ottolengui's help, the master detective uncovers the true story behind the horrible death.