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.
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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

Arthur Hewlett
Marshall

Annette Kerr
Cinema cashier

Cleo Laine
Cleo

Dudley Moore
Rehearsal Pianist (Uncredited)

Max Faulkner
Det. Sgt. Fred Smith (uncredited)
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Reviews
CinemaSerf
This is quite an intriguing murder mystery about a vain composer ("Norman") who has an affair with his sister-in-law ("Peggy"). When she becomes pregnant his wife ("Helen") refuses to divorce him so he and his mistress set about devising a cunning plan to be rid of her. It's quite a simple story, but told with plenty of twists and turns that keep the whole pot boiling nicely. Patricia Dainton is superb as the wife and John Arnatt as the slightly Priestley-esque "Superintendent Ross".
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