This is the story in which Conan Doyle first unleashed the most famous partnership in the history of criminal detection.
An unmarked corpse, a wedding ring, and a mysterious message scrawled in blood are Sherlock Holmes and Doctor Watson's only clues as they follow the trail of a man driven to fulfil a terrible oath he swore more than 20 years before.
Clive Merrison stars as Holmes with Michael Williams as Watson in this adventure, part of the unique fully dramatised BBC canon of Conan Doyle's short stories and novels featuring the world-famous sleuth.