| Doris | Buckle | The young lady at the box office. |
| Mr. | Charlton | Simeon's lawyer. |
| Juan | Estravados | Pilar's father. Jennifer's husband. |
| Pilar | Estravados | Simeon's only granddaughter. Jennifer's daughter. |
| Ebenezer | Farr | Stephen's father. Simeon's former business partner. |
| Stephen | Farr | Ebenezer's son. The guest at Lee's Christmas Party. |
| Jasper | Finch | Sydney's former boss. |
| Colonel | Johnson | The chief constable of Middleshire. |
| Alfred | Lee | Lydia's husband. Simeon's son. |
| David | Lee | Simeon's son. Alfred's brother. |
| George | Lee | Alfred's brother. Simeon's son. |
| Harry | Lee | George's brother. Simeon's son. |
| Hilda | Lee | David's wife. |
| Lydia | Lee | Alfred's wife. |
| Magdalene | Lee | George's wife. |
| Simeon | Lee | The old millionaire. Victim. |
| Hercule | Poirot | The famous Belgian detective. Protagonist. |
| Mr. | Sugden | The superintendent of police. |
| Major | West | Sydney's former boss. |
| Cartwright | | The victim on Poirot's last case. |
| Tressilian | | Simeon's butler. |
| Walter | | The footman. |
