Bill Nighy Leo Argyll Actor Anthony Boyle Jack Argyll Actor Anna Chancellor Rachel Argyll Actor Morven Christie Kirsten Lindstrom Actor Crystal Clarke Tina Argyll Actor Alice Eve Gwenda Vaughan Actor Matthew Goode Philip Durrant Actor Ella Purnell Hester Argyll Actor Eleanor Tomlinson Mary Durrant Actor Luke Treadaway Dr Arthur Calgary Actor Brian McCardie Bellamy Gould Actor Frances Grey Lydia Gould Actor Christian Cooke Mickey Argyll Actor Luke Murray Young Jack Actor Hayden Robertson Young Hester Actor Catriona McNicoll Young Mary Actor Abigail Conteh Young Tina Actor Rhys Lambert Young Mickey Actor Stuart McQuarrie Doctor Actor Sandy Welch Dr Edwin Morsuch Actor Agatha Christie Writer Sarah Phelps Writer, Executive Producer Roopesh Parekh Producer Sandra Goldbacher Director Basi Akpabio Executive Producer James Prichard Executive Producer Karen Thrussell Executive Producer Damien Timmer Executive Producer Gaynor Holmes Executive Producer Helen Ziegler Executive Producer