| 1 | Hercule | Poirot | Famous detective. |
| | Georges | | Arthur's valet. |
| | | | Majestic Hotel - The biggest hotel in St. Loo. |
| | Michael | Seton | Invented an amphibian machine called Albatross. Nick's fiance. |
| | | | Albatross - Amphibian machine. |
| | | | The Solomon Islander - A group of cannibals. |
| | Arthur | Hastings | Hercule's friend. Police. |
| | Magdala | Buckley | Lives at the end house. aka: Nick, young Nick. |
| | Frank | | Nick's friend. |
| | George | | Nick's friend. Sailor. aka: Commander Challenger. |
| | Jim | Lazarus | Art dealer's son. Freddie's second husband. |
| 2 | Ellen | Wilson | Nick's servant. |
| | Mott | | Nick's garage man. |
| | Dr. | Watson | The presumed dog. |
| | Nicholas | Buckley | Nick's grandfather. aka: Old Nick. |
| 3 | Gerald | Buckley | Nick's brother. |
| | Charles | Vyse | Nick's cousin. Lawyer. |
| | Amy | Vyse | Nick's mother. |
| | Freddie | Rice | Nick's best friend. aka: Fredica. |
| | Maggie | Buckley | One of Nick's Yorkshire cousins. |
| 4 | Bella | Hastings | Arthur's wife. |
| 5 | Bert | Croft | Nick's Australian neighbor. |
| | Milly | Croft | Mr. Croft's wife. aka: Mildred Croftin, Milly Merton. |
| | Edith | | Mrs. Croft's nurse attendant. |
| 7 | Timothy | | Nick's great great great uncle. |
| | Matthew | Seton | Mad millionaire who ran the bird sanctuary. Michael's uncle. |
| 8 | Dr. | Graham | Nick's doctor. |
| 9 | Aaron | Lazarus | Jim's father. |
| 12 | William | Wilson | Ellen's husband. Gardener. |
| 14 | Inspector | Japp | Hercule's police inspector friend. |
| 15 | Colonel | Weston | Chief constable. |
| 16 | Giles | Buckley | Maggie's father. Nick's uncle. |
| | Mr. | Whitifield | Law firm head. Matthew's lawyer. |
| | Dr. | Macallister | George's uncle. |
| 17 | Hood | | Man from nursing home. |
| 18 | Jean | Buckley | Maggie's mother. |
| 19 | Alfred | Wilson | William and Ellen's son. |
| | Philip | Buckley | Nick's father. |
