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.
Unfortunately the movie The Sign of Four is not yet available on Disney Plus.
| Directing | Peter Hammond | Director |
| Crew | Ray Goode | Lighting Camera |
| Sound | Patrick Gowers | Original Music Composer |
| Art | Tim Wilding | Production Design |
| Writing | John Hawkesworth | Writer |
| Sound | Phil Smith | Sound Recordist |
| Costume & Make-Up | Glenda Wood | Makeup Artist |
| Production | Lynne Marriott | Production Assistant |
| Camera | Steve Oxley | Focus Puller |
| Lighting | Jim Camp | Electrician |
| Camera | Ray Goode | Director of Photography |
| Production | Bill Leather | Production Manager |
| Camera | Lawrence Jones | Camera Operator |
| Production | Carolyn Bartlett | Casting |
| Writing | Arthur Conan Doyle | Novel |
| Costume & Make-Up | Esther Dean | Costume Design |
| Sound | Brian Blamey | Sound Editor |
| Editing | Anthony Ham | Editor |
| Camera | Ken Roberts | Grip |
| Sound | David Eve | Boom Operator |
| Editing | Tony Cranstoun | Assistant Editor |