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?
as Mrs. Durant
as Louie Knowles
as Colin Knowles
as Supt. Simmons
as Whistler Grant
as Sergeant Bassett
as Carrington-Phelps
as Tony Barlow
as Mrs. O'Connor
as Andrea Durant
as Gwen - The Housekeeper
as Joe Tutt
as Joe - Cloakroom Attendant (uncredited)
as Police Constable (uncredited)
