Timothy Spall John Chapel Actor Gwyneth Keyworth DS Janie Mallowan Actor Steffan Rhodri DCI Barry Clarke Actor Alexandria Riley Helen Baxter Actor Rithvik Andugula DC Evan Chaudhry Actor Amy Griffiths Danielle Rees Actor Vicki Pepperdine Anne Treadway Actor Lu Corfield Leah Jones Actor Oliver Ryan Ceri Richardson Actor Lawrence Walker Ryan Actor Marilyn Cutts Joyce Pugh Actor Mali Harries Bronwen Richards Actor Bettrys Jones Alys Evans Actor Melanie Walters Yvonne Mallowan Actor Zadeiah Campbell-Davies Mel Davies Actor Eryn Kelleher Ava Actor Dylan Malyn Steffan Richards Actor Simon Hynd Director Paul Doolan Writer Madeline Addy Executive Producer Josh Cole Executive Producer Nikki Wilson Producer Sion Trefor Music