| Location of first appearance | Title / Profession | Character | Gender | Age | Hair Color | Hair direction / style | Features |
| Sail-boat pond | Detective Extraordinaire | Hercule Poirot | M | 50+ | Dark | Back, thinning | Neat moustache |
| Sail-boat pond | Captain | Arthur Hastings | M | 50+ | Light grey | Back left | |
| Sail-boat pond | Chief Inspector | James Harold Japp | M | 50+ | Greying dark brown | Right combed | Thick Moustache |
| Whitehaven Mansion | Secretary | Felicity Lemon | F | 40+ | Orange | Right, Wavy | |
| Opening Scene, July | |||||||
| Burlington shopping arcade | Jewellery thief | M | 30+ | Dark | |||
| Friday | |||||||
| Athena Hotel Lobby | Veiled Lady | Millicent Castle-Vaughan | F | 30+ | Black | Wavy short | Daughter of the Earl of Killarney, Engaged to the Duke of Southshire |
| Referred by Cpt Hastings | Earl of Killarney | M | Lady Millicent's father | ||||
| Referred by Lady Millicent | Duke of Southshire | M | Lady Millicent's fiancée | ||||
| Athena Hotel Lobby | "Blackmailer" | Mr Lavington | M | 50+ | Whitening grey | Back-combed, thinning | Leaves for Paris, back Tuesday |
| Referred by newspaper | Englishman | M | Died mysteriously in Holland last Tuesday | ||||
| Saturday | |||||||
| Buena Vista mansion | Housekeeper | Godber | F | 50+ | Dark grey | Wavy | Mole on left cheek |
| Referred by Housekeeper | Tennis player | Fred Perry | M | In real life, won Wimbledon 1934,35,36 | |||
| Sunday | |||||||
| Referred by Japp | Tomfoolery gang leader | Gertie | F | ||||
| Museum | Museum Guard 1 | M | |||||
| Museum | Museum Guard 2 | M | |||||
| Referred by Japp | Gang member | Joey Wetherly | M | ||||
| Mentioned locations | Notes | Distance from London Eye |
| Burlington shopping arcade | In real life, this shopping arcade opened in 1819 and is still open today | W 500m |
| Athena Hotel | Residence of the veiled lady | W 2km |
| Buena Vista, Cedars Avenue | Mr. Lavington’s house in Wimbledon, London | SW 10km |
| Streatham, London | Godber’s home | S 8km |
| Museum of nature | Millicent’s "safe location" | |
| Southshire | Probably fictional |