Timothy Spall John Chapel Actor, Executive Producer Gwyneth Keyworth DS Janie Mallowan Actor Steffan Rhodri DCI Clarke Actor Alexandria Riley Helen Baxter Actor Rithvik Andugula DC Evan Chaudhry Actor Hammed Animashaun Warren Medwin Actor Jacob Ethan Tanner Liam Jenkins Actor Jane Horrocks Polly Trevor Actor Hannah Daniel Sally Morris Actor Melanie Walters Yvonne Mallowan Actor Simon Hynd Director Paul Doolan Writer, Executive Producer Madeline Addy Executive Producer Josh Cole Executive Producer Nikki Wilson Producer Sion Trefor Music