David Mitchell John Taylor Actor Anna Maxwell Martin Lucy Betts-Taylor Actor Dipo Ola DI Russell Carter Actor Mark Bonnar Gareth Fisher Actor Ralph Ineson Chief Constable Ziegler Actor Dorothy Atkinson DCS Carol Shaw Actor Karl Pilkington DI Matt Neville Actor Ben Ashenden DC Ethan Cole Actor Rumi Sutton DC Caitlin Sullivan Actor Dylan Hughes Henry Betts-Taylor Actor Gassan Abdulrazek Dexter Hassan Actor Giulio Cavazzini Luca Rossi Actor James Cooney Milo Gesalan Actor Suzanne Ahmet Gillian Neville Actor Georgie Fallon Producer Mark Brotherhood Writer Stella Corradi Director