The Sign of Four
- Cast: Jeremy Brett, Edward Hardwicke, Jenny Seagrove, Ronald Lacey, John Thaw
- Duration: 103 minutes
- Genre: Crime, Mystery, Thriller
- Rating: 7.35/10
- Release Date: 1987-03-07
Mary Morstan has received a pearl in the post every year since her father's disappearance. This leads Holmes and Watson to the truth about a secret pact between four convicts during the Indian Rebellion of 1857.
