The Third Alibi (1961)

• IMDb: 7.0/10 (429)
• 15 Mar 1961
• 68 mins

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.