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. |