A composer (Laurence Payne) is stuck in a middle-class marriage and finds that his affair with his wife's half-sister (Jane Griffiths) has resulted in a pregnancy. When his wife refuses to give him a divorce he hatches a murder scheme that is too clever by half.
Laurence Payne
as Norman Martell
Patricia Dainton
as Helen Martell
Jane Griffiths
as Peggy Hill
Edward Underdown
as Dr. Peter Murdoch
John Arnatt
as Supt. Ross
Humphrey Lestocq
as Simmons, the Producer
Lucy Griffiths
as Miss Potter
Olive Milbourne
as Mrs. Booth
Arthur Hewlett
as Marshall
Annette Kerr
as Cinema cashier
Cleo Laine
as Cleo
Dudley Moore
as Rehearsal Pianist (Uncredited)
