Episode
The Sign of Four: Sherlock Holmes' Greatest Case
- Adaptation: Wontner films
- Episode: 3
- Airdate: 14 August 1932
- IMDb: The Sign of Four: Sherlock Holmes' Greatest Case
- Letterboxd: The Sign of Four: Sherlock Holmes' Greatest Case
- Canon basis: The Sign of the Four
Previous: The Missing Rembrandt
Next: The Triumph of Sherlock Holmes
(cast list not finalised)