David Mitchell John Taylor Actor, Executive Producer Anna Maxwell Martin Lucy Betts-Taylor Actor Dipo Ola DI Russell Carter Actor Mark Bonnar Gareth Fisher Actor Stephen Merchant Danny Sloane Actor Sian Clifford Joanne Kemper Actor Ralph Ineson Chief Constable Ziegler Actor Dorothy Atkinson DCS Carol Shaw Actor Ben Ashenden DC Ethan Cole Actor Dylan Hughes Henry Betts-Taylor Actor Michael Wildman DCC Clint Radley Actor Daniel Lawrence Taylor Aiden Mooney Actor Giulio Cavazzini Luca Rossi Actor Kirsty Hoiles Helena Moss Actor Rory Douglas-Speed Tristan Price Actor Nemide May Coco Aarons Actor Suzanne Ahmet Gillian Neville Actor Rumi Sutton DC Caitlin Sullivan Actor Bairavi Manoharan Hannah Foster Actor Dujonna Gift Tiffany Catley Actor Georgie Fallon Producer Mark Brotherhood Writer, Executive Producer Stella Corradi Director George Kane Director Kenton Allen Executive Producer Kathryn O'Connor Executive Producer Chris Sussman Executive Producer Toby Welch Executive Producer