The Third Alibi

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

Humphrey Lestocq

Simmons, the Producer

Lucy Griffiths

Miss Potter

Olive Milbourne

Mrs. Booth

Arthur Hewlett

Marshall

John Arnatt

Supt. Ross

Cleo Laine

Cleo

Dudley Moore

Rehearsal Pianist (Uncredited)

Annette Kerr

Cinema cashier