| 1 | Hercule | Poirot | Arthur's friend. Belgian detective. |
| | Cinderella | | Arthur's new acquaintance. Acrobat. aka: Miss Robinson. |
| 2 | Inspector | Japp | Police inspector from Scotland. Hercule's friend. |
| | Paul | Renauld | Hercule's client. Deceased. |
| | Arthur | Hastings | Narrator. Hercule's friend. |
| 3 | Sergent | de Ville | Mr. Renauld's security. |
| | Lucien | Bex | Commissary of Police. Hercule's old companion. |
| | | Hautet | Examining magistrate in Mr. Renauld's case. |
| | Eloise | Renauld | Mr. Renauld's wife. |
| | Dr. | Durand | Doctor. |
| | Mr. | Giraud | Famous detective in Paris Surete. |
| | Francoise | Arrichet | The old housekeeper of the Ranaulds. |
| | Denise | Oulard | Leonie's sister. The housemaid of the Renaulds. |
| | Leonie | Oulard | Denise's sister. The housemaid of the Renaulds. |
| | Jack | Renauld | Mr. Renauld's son. |
| | La | Vicomtesse | Francoise's former boss. |
| | | Daubreuil | Someone Mr. Renauld is seeing secretly. |
| 4 | Gabriel | Stonor | Mr. Renauld's security. |
| | Bella | Duveen | The mystery woman Mr. Renauld paid a cheque to. |
| 7 | Auguste | | Mr. Renauld's gardener. |
| | Marthe | Daubreuil | Mrs. Daubreuil's daughter. |
| | Amelie | | Mrs. Daubreuil's housemaid. |
| 8 | Marchaud | | Security on duty. |
| 13 | | Le Cure | Vicar. |
| | Jeanne | Beroldy | The notorious muderess. |
| 16 | Arnold | Beroldy | Jeanne's husband. Junior partner in a firm of Wine Merchants. |
| | Georges | Conneau | Young lawyer. Jeanne's lover. |
| | Hiram P. | Trapp | Jeanne's lover. |
| 21 | Joseph | Aarons | Cinderella's theatrical agent. |
| | George | Robey | Comic comedian. |
| 25 | Maitre | Grosier | Jack's counsel. |
| 26 | Dulcie | Duveen | Bella's twin sister. |
