Celebrated crime writer Colin Knowles finds himself at the centre of a baffling real-life mystery when his estranged wife Louie asks for his help. Her new boss has gone missing at his grand country home -- and when his body is found, the hunt is on for a devious and twisted murderer. Sinister letters from London refer to a 'double crime'. Who will be the killer's next victim?
| Directing | Daniel Birt | Director |
| Writing | Brock Williams | Screenplay |
| Sound | Monica Ross | Sound Mixer |
| Production | Theo Lageard | Producer |
| Production | Bernard Robinson | Associate Producer |
| Sound | Frank Chacksfield | Music |
| Crew | Hone Glendinning | Lighting Camera |
| Editing | Anne Barker | Editor |
| Art | George Jones | Art Direction |
| Costume & Make-Up | Bill Griffiths | Hairstylist |
| Costume & Make-Up | Sidney Turner | Makeup Artist |
| Directing | Zachary Booth | First Assistant Director |
| Sound | Eric Humphriss | Sound Supervisor |
| Sound | Frank Chacksfield | Conductor |
| Camera | Peter Lambert | Camera Operator |
| Camera | Bert Mason | Camera Operator |
| Directing | Doris Martin | Continuity |
