Sarah Phelps Creator, Executive Producer, Writer Sarah Greene Cassie Maddox Actor Killian Scott Rob Reilly Actor Conleth Hill O'Kelly Actor Tom Vaughan-Lawlor Frank Actor Moe Dunford Sam O'Neill Actor Jonny Holden Damien Donnelly Actor Sam Keeley Daniel March Actor Ian Kenny Phelan Actor Peter McDonald Jonathan Devlin Actor Leah McNamara Rosalind Devlin Actor Eugene O'Hare Detective Quigley Actor Alan Gasmer Executive Producer Ed Guiney Executive Producer Elizabeth Kilgarriff Executive Producer Kate Harwood Executive Producer Noemi Spanos Executive Producer Peter Jaysen Executive Producer Rebecca Gatward Executive Producer Saul Dibb Executive Producer Carmel Maloney Producer John Hayes Director