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.
| Directing | Peter Hammond | Director |
| Writing | John Hawkesworth | Writer |
| Writing | Arthur Conan Doyle | Characters |
| Art | Tim Wilding | Production Design |
| Sound | Patrick Gowers | Original Music Composer |
| Crew | Ray Goode | Lighting Camera |
