Sarah Phelps Creator, Writer, Executive Producer Sarah Greene Cassie Maddox Actor Killian Scott Rob Reilly Actor Antonio Aakeel Rafe Lahiri Actor Ned Dennehy Dr Cooper Actor Carolyn Bracken Sandra Sculley Actor Moe Dunford Sam O'Neill Actor Jonathan Forbes Dr Mark Hanley Actor Jonny Holden Damien Donnelly Actor Ian Kenny Garda Phelan Actor Vanessa Emme Abby Stone Actor Peter McDonald Jonathan Devlin Actor Leah McNamara Rosalind Devlin Actor Sam Keeley Daniel March Actor Charlie Kelly Justin Mannering Actor Alexandra Moen Simone Cameron Actor Eugene O'Hare Detective Devlin Actor Tom Vaughan-Lawlor Frank Mackey Actor Ericka Roe Alannah Shorey Actor Conleth Hill Superintendent O'Kelly Actor Niall Jordan Peter Savage Actor Saul Dibb Director, Executive Producer Carmel Maloney Producer John Hayes Director Kate Harwood Executive Producer Noemi Spanos Executive Producer Elizabeth Kilgarriff Executive Producer Rebecca Gatward Executive Producer, Director Tommy Bulfin Executive Producer Alan Gasmer Executive Producer Ed Guiney Executive Producer Peter Jaysen Executive Producer Tana French Writer