| Person | Type | Job | Role(s) | Episodes |
|---|---|---|---|---|
 Agatha Christie | Crew | Writing | Novel | 3 |
 Joel Devlin | Crew | Camera | Director of Photography | 3 |
John Rodda | Crew | Sound | Sound Mixer | 3 |
Farah Abushwesha | Crew | Production | Producer | 3 |
Robert Hall | Crew | Editing | Editor | 3 |
 Alex Gabassi | Crew | Directing | Director | 3 |
Jeff Tessler | Crew | Art | Production Design | 3 |
Sarah Phelps | Crew | Writing | Writer | 3 |
Simon Brasse | Crew | Editing | Editor | 3 |
 Isobel Waller-Bridge | Crew | Sound | Original Music Composer | 3 |
 Zarene Dallas | Crew | Crew | Stunts | 1 |
 Cyril Nri | Cast | Actor | Father Anselm | 1 |
 Gregor Fisher | Cast | Actor | Dexter Dooley | 1 |
 Henry Goodman | Cast | Actor | Prynne | 1 |
 John Malkovich | Cast | Actor | Hercule Poirot | 3 |
 Kevin McNally | Cast | Actor | Inspector Japp | 1 |
 Rupert Grint | Cast | Actor | Inspector Crome | 3 |
 Shirley Henderson | Cast | Actress | Rose Marbury | 3 |
 Suzanne Packer | Cast | Actress | Capstick | 3 |
 Tara Fitzgerald | Cast | Actress | Lady Hermoine Clarke | 3 |
 Eamon Farren | Cast | Actor | Cust | 3 |
 Andrew Buchan | Cast | Actor | Franklin Clarke | 3 |
 Eve Austin | Cast | Actress | Betty Barnard | 3 |
 Freya Mavor | Cast | Actress | Thora Grey | 3 |
 Jack Farthing | Cast | Actor | Donald Fraser | 3 |
 Bronwyn James | Cast | Actress | Megan Barnard | 3 |
 Conrad McCroddan | Cast | Actor | Beautiful Young Man | 3 |
 Ash Matthews | Cast | Beddows | 1 | |
 Alexander Kirk | Cast | Weddle | 1 | |
 Tamzin Griffin | Cast | Actress | Alice Asher | 1 |
 Neil Hurst | Cast | Actor | Benny Grew | 1 |
 Anya Chalotra | Cast | Actress | Lily Marbury | 3 |
 Lorenzo Harani | Cast | Actor | Refugee Man | 1 |
| Person | Type | Job | Role(s) | Episodes |
