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. |