![The Third Alibi](https://image.chilimovie.com/region2/en/300px/20240322/wgt5yedpWUE60HutNnL5KjiBYPR.jpg)
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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.