Holmes and Watson travel to Sussex to investigate the murder of Squire Douglas, who was shot to death in a sealed-up castle, with only two apparent suspects.
Dr. Watson accidentally comes home from his club with another man's coat, providing an important clue when the other man is murdered late that same night.
Sherlock Holmes seeks a rational explanation for the Winthrop family legend, which foretells the death of any family member who unexpectedly finds silver coins in his possession.
Sherlock Holmes investigates a strange story told to him by a shopkeeper, who claims to have been a member of the 'League of Red-Headed Men' until it unexpectedly dissolved.