For years, a blackmailer has been preying on the weaknesses of others throughout London. When Holmes hears of the utter misery this mystery man is creating, he adopts a campaign to thwart his evil scheming. The campaign astonishes Dr. Watson by its strangeness and finds Holmes falling in love.
| Directing | Peter Hammond | Director |
| Writing | Jeremy Paul | Writer |
| Writing | Arthur Conan Doyle | Novel |
| Production | Sally Head | Executive Producer |
| Production | June Wyndham-Davies | Producer |
| Sound | Patrick Gowers | Music |
| Crew | David Odd | Cinematography |
| Editing | Clive Maltby | Editor |
| Production | Carolyn Bartlett | Casting |
| Art | Chris Truelove | Production Design |
| Art | Colin Pocock | Art Direction |
| Costume & Make-Up | Esther Dean | Costume Design |
| Crew | Andy Bradford | Stunts |
| Crew | Dorothy Ford | Stunts |
| Crew | Tom Lucy | Stunts |
