Harry and Valerie Spalding arrive in the remote Cornish village to an unwelcoming and suspicious population. Harry's brother dies suddenly, bitten by a lethal reptilian bite. They befriend a young woman Anna whose tyrannical father controls her life and, as they discover that others in the village have suffered a similar fate, their investigations lead to Anna. What they uncover is a victim of the most terrifying legacy... a destiny of mutilation and murder.
| Art | Don Mingaye | Art Direction |
| Camera | Arthur Grant | Director of Photography |
| Editing | Roy Hyde | Editor |
| Costume & Make-Up | Frieda Steiger | Hairstylist |
| Production | Anthony Nelson Keys | Producer |
| Art | Bernard Robinson | Production Design |
| Costume & Make-Up | Roy Ashton | Makeup Artist |
| Writing | Anthony Hinds | Writer |
| Directing | John Gilling | Director |
| Sound | Don Banks | Original Music Composer |
| Directing | Lorna Selwyn | Continuity |
| Production | George Fowler | Production Manager |
| Directing | William P. Cartlidge | Assistant Director |
| Sound | Roy Baker | Sound Editor |
| Sound | Leonard Bulkley | Sound Recordist |
| Crew | Les Bowie | Special Effects |
| Camera | Moray Grant | Camera Operator |
