| 1 | | | Spain, 1930 |
| | Megan | | An actor. |
| | Henry | | Megan's ex-boyfriend. |
| | Bunny | | Megan and Henry's friend. |
| | William | Shakespeare | An English playwright, poet, and actor. |
| 2 | | | The First Conversation |
| | Julia | Hart | An editor of a small publishing house. |
| | Grant | McAllister | A professor in mathematics. |
| | John | Milton | An English poet. |
| | Victor | Leonidas | Julia Hart's employer. |
| | Professor | Daniels | Grant's colleague. |
| 3 | | | Death at the Seaside |
| | Winston | Brown | An assistant to the police. |
| | Gordon | Foyle | Jennifer's admirer. |
| | Vanessa | Allen | Gordon Foyle's acquaintance. |
| | Jennifer | | Vanessa's daughter. |
| | Inspector | Wild | Winston Brown's friend. |
| | Mrs. | Epstein | Gordon's acquaintance. |
| | Jacob | | A dog. |
| | Symons | | The boat owner. |
| | Daisy | Lancaster | Symons' wife. |
| 4 | | | The Second Conversation |
| | Elizabeth | White | An actor and playwright. |
| 5 | | | A Detective and His Evidence |
| | Rose | | A girl who is always full of energy. |
| | Maggie | | Rose's friend. |
| | Christopher | | Rose and Maggie's new acquaintance. |
| | Alice | Cavendish | Maggie's sister. |
| | Richard | Parker | Alice's acquaintance. |
| | Elise | | A maid. |
| | Lesley | Clements | Alice's friend. |
| | | Laurice | A detective inspector. |
| | | Bulmer | A detective sergeant. |
| | | Davis | A police constable. |
| | Mr. | Cavendish | Alice's father. |
| | Dr. | Mortimer | Cavendish's family doctor. |
| | Mrs. | Cavendish | Alice's mother. |
| | Andrew | Sullivan | Alice's childhood friend. |
| | | Cooper | A policeman. |
| | Mrs. | Sullivan | Andrew Sullivan's mother. |
| | Michael Percy | Christopher | A theatrical agent. |
| 7 | | | An Inferno In Theater Land |
| | Helen | Garrick | A teacher. |
| | Mr. | Lou | The restaurant manager. |
| | Griff | Banks | Helen Garrick's new acquaintance. |
| | Scarlett | | Griff Banks' partner. |
| | Andrew | Carter | Helen Garrick's new acquaintance. |
| | Vanessa | Carter | Andrew Carter's sister. |
| | Wendy | Copeland | Helen Garrick's new acquaintance. |
| | Harry | Trainer | A playwright. |
| | James | | Griff's acquaintance. |
| | Rhonda | | Harry's latest flame. |
| 9 | | | Trouble On Blue Peace Island |
| | Sarah | | Charles' second wife. |
| | Charles | | A retired army. |
| | Henrietta | | Charles' daughter. |
| | Mrs. | Stubbs | Sarah's new acquaintance. |
| | Mr. | Stubbs | Mrs. Stubbs' husband. |
| | Unwin | | Mr. and Mrs. Stubbs' new acquaintance. |
| | Annabel | Richards | A teacher. |
| | Andrew | Packer | A lawyer. |
| | Richard | Branch | A socialist. |
| | Thomas | Townsend | An alcoholic who was accused of murdering his wife. |
| | Scarlett | Thorpe | A slattern, accused of seducing a man persuading him to suicide. |
| | Mrs. | Tranter | An old lady who was also attending on the occasion. |
| | Sofia | | Mrs. Tranter's companion. |
| 11 | | | The Cursed Village |
| | Godwin | Lamb | A doctor. |
| | Alfred | | Dr. Lamb's companion. |
| | Lily | Mortimer | Dr. Lamb's patient. |
| | Matthew | | Lily's uncle. |
| | Violet | | Lily's sister. |
| | Ben | Crake | Violet's husband. |
| | Agnes | Mortimer | Lily's grandmother. |
| | William | | Lily's cousin. |
| | Lauren | | Mathew's wife. |
| | Dorothea | Dickson | Lily's grand-aunt. aka: Dot. |
| | Raymond | | The gardener. |
| 12 | | | The Sixth Conversation |
| | Francis | Gardner | Grant's friend. |
| 13 | | | The Shadow on the Staircase |
| | Lionel | Moon | A detective. |
| | Mrs. | Hashemi | Detective Moon's landlady. |
| | Inspector | Goode | Lionel's partner. |
| | Hanna | | The housecleaner. |
| | Mr. | Bell | A photographer. |
| | Mr. | Pine | Lionel's neighbor. |
| | Keller | | A Hungarian counterfeiter. |
| | Erick | Laurent | Lionel's new partner. |
| | Dr. | Purvis | Laurent's friend. |
| 15 | | | The Final Conversation |
| | Eustace | Aaron | A detective. |
| | Lionel | Benedict | A detective. |
| 16 | | | The First Ending |
| | Victor | | One of Julia Hart's cats. |
| | Leonidas | | One of Julia Hart's cats. |
