| Location of appearance | Title | Character | Gender | Age | Hair Color | Hair Style | Features |
| Detective | Hercule Poirot | M | 50+ | Dark | Thinning | Nice moustache | |
| Captain | Hastings | M | 50+ | Grey | |||
| Chief Inspector | James Japp | M | 50+ | Brown | |||
| Secretary | Felicity Lemon | F | 40+ | Chestnut | |||
| Buenos Aires before Iris' death | |||||||
| Hotel | Pauline Wetherby | F | 20+ | Carrot | Curly, long | White&green hat | |
| Hotel | Journalist | Anthony Chapell | M | 30+ | Dark brown | Left combed | |
| Referred | President | M | 70+ | ||||
| Hotel | Subcontractor | Stephen Carter | M | 50+ | Grey | Balding | Light brown thicker moustache than Barton's |
| Referred | Late Lord | Wetherby | M | Served under Ramsay MacDonald. Father to Pauline & Iris | |||
| General's room | Sovereign Oil magnate | Barton Russell | M | 40+ | Dark brown | Back combed, Thinning | Moustache. Will hold a dinner at Jardin des Cygnes |
| General's room | Minister of Oil | General Pereira | M | 60+ | Grey | Balding | Moustache. Officer uniform. Gave Barton an Oil concession in Santa Cruz |
| Hotel reception | Hotel Receptionist | M | 40+ | Dark | Balding | ||
| Hotel reception | Iris Russell | F | 20+ | Dark brown | Curly to the left | Barton's wife. Inherited Lord Wetherby's fortune | |
| Le Jardin des Cygnes | Dance performer | Lola Valdez | F | 30+ | Dark brown | Curlycurly mid parted | |
| Le Jardin des Cygnes | Patron de Restaurante | Luigi De Monico | M | 40+ | Dark | Thinning | Moustache |
| Le Jardin des Cygnes | Singer | F | 30+ | Dark | Wavy | ||
| 2 years after Iris' death | |||||||
| Graveyard, Reepham, Norfolk | Barton Russell | M | 40+ | Dark brown | Back combed, Thinning | Moustache | |
| Graveyard, Reepham, Norfolk | Pauline Wetherby | F | 20+ | Carrot | Curly | Green hat | |
| Le Jardin des Cygnes | Patron de Restaurante | Luigi De Monico | M | 40+ | Dark | Thinning | Moustache |
| Theatre | Dance performer | Lola Valdez | F | 30+ | Dark brown | Curlycurly mid parted | |
| News office | Journalist | Anthony Chapell | M | 30+ | Dark brown | Left combed | Engaged with Pauline |
| Prison | Ex-Minister of Oil | General Pereira | M | 60+ | Grey | Balding | Caught Embezzling. Sovereign Oil apparently lost the Santa Cruz concession after this |
| Sovereign Oil Office | Subcontractor | Stephen Carter | M | 50+ | Grey | Balding | Light brown thicker moustache than Barton's |
| Graveyard, Reepham, Norfolk | Solicitor | Mr Grove | M | 70+ | Whitish | Right combed | |
| Le Jardin des Cygnes | Singer | F | 30+ | Bleached blond | Curly to the right | ||
| Legend |
| Characters present both before and 2 years after Iris' death |
| Characters present at the dinner table for 6 in Buenos Aires |
| All others |
| Testaments | Contents |
| Lord Russel's will | All to Iris since Pauline was already cared for by Barton |
| Iris' will | All to Pauline upon her 21st birthday. Fortune administered by Barton until then. |
| Pauline's will | ? She was accompanied by a man who appeared to be her fiancée |
| Locations | Notes |
| Hotel in Buenos Aires | Argentina |
| Le Jardin Des Cygnes | Means “Garden of Swans” |
| Graveyard, Reepham | In Norfolk, East England |