

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.
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Cast

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)
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