Gillian Anderson
as Detective Superintendent Stella Gibson
Jamie Dornan
as Paul Spector
John Lynch
as Jim Burns
Bronagh Waugh
as Sally-Ann Spector
Niamh McGrady
as Danielle Ferrington
Stuart Graham
as Matt Eastwood
Valene Kane
as Rose Stagg
Colin Morgan
as Tom Anderson
Archie Panjabi
as Paula Reed Smith
Aisling Franciosi
as Katie Benedetto
Jonjo O'Neill
as Tom Stagg
Frank McCusker
as Garrett Brink
Aisling Bea
as Kiera Sheridan
Ben Peel
as James Olson
Ian McElhinney
as Morgan Monroe
Ruth Bradley
as Wallace
Michael McElhatton
as Rob Breedlove
Richard Coyle
as Dr. O'Donnell
Barry Ward
as Dr. Spencer
Krister Henriksson
as Dr. Larson
Laura Donnelly
as Sarah Kay
Aidan McArdle
as Healy
Denise Gough
as Dr. Walden
Martin McCann
as Alvarez