Lord Peter Wimsey investigates after the novelist Harriet Vane is accused of poisoning her former lover.
| Name | Type | Role | |
|---|---|---|---|
| Amanda Murray | Guest Star | Marjorie Phelps | |
| David Quilter | Guest Star | Chief Inspector Parker | |
| Margaretta Scott | Guest Star | The Dowager Duchess of Denver | |
| Patsy Byrne | Guest Star | Mrs. Pettican | |
| Preston Lockwood | Guest Star | Judge | |
| Bernard Martin | Guest Star | 1st. Court Reporter | |
| Clive Francis | Guest Star | Norman Urquhart | |
| Tilly Vosburgh | Guest Star | Hannah Westlock | |
| Ronald Leigh-Hunt | Guest Star | Sir Impey Biggs | |
| Roger Davidson | Guest Star | 2nd. Court Reporter | |
| Timothy Bateson | Guest Star | Pond | |
| Paul Hastings | Guest Star | Philip Boyes | |
| Carol Frazer | Guest Star | Sylvia Mariott | |
| Derek Ensor | Guest Star | Crofts | |
| Michael Fleming | Guest Star | Clerk of the Court | |
| Shirley Cain | Guest Star | Miss Climpson | |
| Derek Royle | Guest Star | The Rev. Arthur Boyes | |
| Alwyne Taylor | Guest Star | Eiluned Price | |
| Christopher Scoular | Guest Star | Freddy Arbuthnot | |
| Patrick Carter | Guest Star | Usher | |
| Norma Streader | Guest Star | Miss Murchison | |
| Geoffrey Beevers | Guest Star | Ryland Vaughan |