The Third Alibi (1961) 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.
Night Was Our Friend (1951) Missing for two years husband (Michael Gough) returns home to his wife (Elizabeth Sellars) suffering with severe mental problems. However, his wife in her husband's absence - has met and fallen in love with a doctor (Ronald Howard) she looks after her husband who becomes more deranged and commits suicide putting his wife under suspicion of murder.
Stranger In Town (1957) An American composer living in a sleepy English village is shot dead. A journalist (Alex Nicol) probes the death, the trail running to the local gossip (Mona Washbourne) who is found gassed.