
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
Norman Martell

Patricia Dainton
Helen Martell

Jane Griffiths
Peggy Hill

Edward Underdown
Dr. Peter Murdoch

John Arnatt
Supt. Ross

Humphrey Lestocq
Simmons, the Producer

Lucy Griffiths
Miss Potter
Olive Milbourne
Mrs. Booth

Arthur Hewlett
Marshall

Annette Kerr
Cinema cashier

Cleo Laine
Cleo

Dudley Moore
Rehearsal Pianist (Uncredited)

Detour
Detour

Out of Bounds
Out of Bounds

Paris Blues
Paris Blues

The Keys to Happiness
The Keys to Happiness

Cast a Dark Shadow
Cast a Dark Shadow

The Roman Spring of Mrs. Stone
The Roman Spring of Mrs. Stone

Witness for the Prosecution
Witness for the Prosecution

Lake Consequence
Lake Consequence

Fuga
Fuga

Dodsworth
Dodsworth

The Last Letter from Your Lover
The Last Letter from Your Lover

The Front Runner
The Front Runner