Kenneth Branagh Hercule Poirot Director, Actor, Producer Tina Fey Ariadne Oliver Actor Camille Cottin Olga Seminoff Actor Riccardo Scamarcio Vitale Portfoglio Actor Kelly Reilly Rowena Drake Actor Jude Hill Leopold Ferrier Actor Jamie Dornan Dr. Leslie Ferrier Actor Rowan Robinson Alicia Drake Actor Michelle Yeoh Mrs. Reynolds Actor Emma Laird Desdemona Holland Actor Kyle Allen Maxime Gerard Actor Ali Khan Nicholas Holland Actor Michael Green Screenwriter Judy Hofflund Producer Simon Kinberg Producer Ridley Scott Producer Mark Gordon Executive Producer Louise Killin Executive Producer James Prichard Executive Producer Haris Zambarloukos Cinematographer Lucy Donaldson Film Editing Hildur Guðnadóttir Original Music John Paul Kelly Production Design Chris Stephenson Art Director Celia Bobak Set Decoration Sammy Sheldon Costume Design Lucy Bevan Casting