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?
Adrianne Allen
as Mrs. Durant
Sarah Lawson
as Louie Knowles
Richard Gale
as Colin Knowles
Duncan Lamont
as Supt. Simmons
Meredith Edwards
as Whistler Grant
Nigel Green
as Sergeant Bassett
John Blythe
as Carrington-Phelps
John Horsley
as Tony Barlow
Jean St. Clair
as Mrs. O'Connor
Pamela Galloway
as Andrea Durant
Simone Lovell
as Gwen - The Housekeeper
Claude Dampier
as Joe Tutt
