Series 4
Episodes
1 In at the Deep End May 27, 1975 2 A Slight Case of Matrimony Jun 3, 1975 
3 No Second Chance Jun 10, 1975 4 A Murmur of Malice Jun 17, 1975 5 The Italian Debt Jun 24, 1975 6 A Lady of Considerable Talent Jul 1, 1975 7 Creatures in a Private Zoo Jul 8, 1975 8 A Good Place for Murder Jul 15, 1975 9 A Matter of Self-defence Jul 22, 1975 10 The Rag Doll Jul 29, 1975 11 The End of the Good Times Aug 5, 1975 12 The Fixer Aug 12, 1975
3 No Second Chance Jun 10, 1975 4 A Murmur of Malice Jun 17, 1975 5 The Italian Debt Jun 24, 1975 6 A Lady of Considerable Talent Jul 1, 1975 7 Creatures in a Private Zoo Jul 8, 1975 8 A Good Place for Murder Jul 15, 1975 9 A Matter of Self-defence Jul 22, 1975 10 The Rag Doll Jul 29, 1975 11 The End of the Good Times Aug 5, 1975 12 The Fixer Aug 12, 1975