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The Rivals of
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| Robert Love | (1971) | ||
| Jonathan Alwyn | (1971) | ||
| Reginald Collin | (1973) |
| Lloyd Shirley | (1971) | ||
| Kim Mills | (1973) |

| Prog. | Episode Title | Dramatized by | Directed by | First Broadcast | |
|---|---|---|---|---|---|
| Series 1 | 1 | A Message from the Deep Sea | Philip Mackie | James Goddard | 20 September 1971 |
| 2 | The Missing Witness Sensation | Philip Mackie | Jonathan Alwyn | 27 September 1971 | |
| 3 | The Affair of the Avalanche Bicycle and Tyre Co Ltd | Julian Bond | James Goddard | 4 October 1971 | |
| 4 | The Duchess of Wiltshire's Diamonds | 11 October 1971 | |||
| 5 | The Horse of the Invisable | 18 October 1971 | |||
| 6 | The Case of the Portugal Mirror | Philip Mackie | 25 October 1971 | ||
| 7 | Madam Sara | 1 November 1971 | |||
| 8 | The Case of the Dixon Torpedo | 8 November 1971 | |||
| 9 | The Woman in the Big Hat | 15 November 1971 | |||
| 10 | The Affair of the Tortoise | 22 November 1971 | |||
| 11 | The Asyrian Rejuvenator | 29 November 1971 | |||
| 12 | The Ripening Rubies | 6 December 1971 | |||
| 13 | The Case of Laker, Absconded | 13 December 1971 | |||
| Series 2 | 14 | The Mysterious Death on the Underground Railway | 29 January 1973 | ||
| 15 | Five Hundred Carats | 5 February 1973 | |||
| 16 | In Cell 13 | 12 February 1973 | |||
| 17 | The Secrets of the Magnifique | Gerald Kelsey | 19 February 1973 | ||
| 18 | The Absent-Minded Coterie | 26 February 1973 | |||
| 19 | The Sensible Action of Lieutenant Holst | 5 March 1973 | |||
| 20 | The Superfluous Finger | 12 March 1973 | |||
| 21 | Anonymous Letters | 19 March 1973 | |||
| 22 | The Moabite Cipher | 26 March 1973 | |||
| 23 | The Secret of the Foxhunter | 2 April 1973 | |||
| 24 | The Looting of the Specie Room | 9 April 1973 | |||
| 25 | The Mystery of the Amber Beads | 16 April 1973 | |||
| 26 | The Missing QCs | 7 May 1973 | |||