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 Payneas Norman MartellPatricia Daintonas Helen MartellJane Griffithsas Peggy HillEdward Underdownas Dr. Peter MurdochJohn Arnattas Supt. RossHumphrey Lestocqas Simmons, the ProducerLucy Griffithsas Miss PotterOlive Milbourneas Mrs. BoothArthur Hewlettas MarshallAnnette Kerras Cinema cashierCleo Laineas CleoDudley Mooreas Rehearsal Pianist (Uncredited)Sylvia Davisas Cinema sales girl (uncredited)Max Faulkneras Det. Sgt. Fred Smith (uncredited)Garard Greenas Patrol car policeman (uncredited)Arthur Howellas P.C. Williams (uncredited)Richard Nelleras Sleeping Man in Theater (uncredited)Pat Ryanas Detective Examining Tape-Recorder (uncredited)Stuart Saundersas Cinema manager (uncredited)Arthur Skinneras Det. Sgt. Carter (uncredited)John Tathamas Detective / Fingerprints Officer (uncredited)