Andrea Riseborough

Colette McVeigh

Clive Owen

Mac

Gillian Anderson

Kate Fletcher

Aidan Gillen

Gerry

Domhnall Gleeson

Connor

Brid Brennan

Ma

David Wilmot

Kevin Mulville

Stuart Graham

Ian Gilmour

Martin McCann

Brendan

Maria Laird

Young Collette

Barry Barnes

Gerry Senior

Michael McElhatton

Liam Hughes

Gary Lydon

Geoff

Daniel Tatarsky

Watcher

Tom Bennett

Watcher #2

Nicholas Asbury

Agent

Morgan Watkins

MI5 Officer

Karl Shiels

Mulville's Driver / Gunman

Mark Huberman

RUC Officer at Hospital

Eoin Murtagh

Louie, Fletcher's Son

Nia Gwynne

Female Watcher

Alan O'Neill

RUC Officer

David Herlihy

Senior Staff Officer

Kate Nic Chonaonaigh

Henderson's Wife

Lisa Walsh

Brendan's Girlfriend

Una Carroll

Brendan's Mum

Anna Elizabeth McGrath

Mourner (uncredited)