Radio personalities Larry Abbot and Vickie Pearle are stars of a mystery show. Since they announced their engagement, Larry has been plagued by speech problems and, seeking out an unconventional cure, he returns to his boyhood home, a mansion in the countryside, bringing Vickie along. Larry reunites with numerous family members, but discovers that there are sinister things afoot within the walls of the creepy estate.
| Directing | Gene Wilder | Director |
| Art | Terence Marsh | Production Design |
| Art | Alan Tomkins | Art Direction |
| Directing | Nikki Clapp | Script Supervisor |
| Production | Irene Lamb | Casting |
| Crew | Colin Skeaping | Stunt Coordinator |
| Camera | Fred Schuler | Director of Photography |
| Art | Michael Seirton | Set Decoration |
| Production | Susan Ruskin | Producer |
| Production | Basil Rayburn | Associate Producer |
| Costume & Make-Up | Ruth Myers | Costume Design |
| Sound | John Morris | Original Music Composer |
| Camera | Graham Attwood | Still Photographer |
| Editing | Christopher Greenbury | Editor |
| Production | Emile Buyse | Associate Producer |
| Writing | Gene Wilder | Writer |
| Writing | Terence Marsh | Writer |
| Sound | Robert Hathaway | Music Editor |
| Costume & Make-Up | Joan Carpenter | Hair Supervisor |
| Costume & Make-Up | Graham Freeborn | Makeup Artist |
| Costume & Make-Up | Stuart Freeborn | Makeup Supervisor |
| Costume & Make-Up | Richard Mills | Makeup Artist |
| Production | Basil Rayburn | Production Supervisor |
| Costume & Make-Up | Annie Townsend | Hairstylist |
| Costume & Make-Up | Kay Freeborn | Makeup Artist |
| Art | Reg Bream | Draughtsman |
| Crew | Tracey Eddon | Stunts |
