- Flora Montgomery - McCallister
- Asan N'Jie - Larry
- Brenda McNeill - Bomb disposal officer
- Nigel Mercier - HMSU Commander
- Kathy Kiera Clarke - Clare Keenan
- Caolan Byrne - Ben McFarland
- Emer Casey - Sandwich Shop Owner
- Roy Heaybeard - Farmer
- Sean Sloan - Pat's Solicitor
- Ian McElhinney - Adam Corry
- Peter Ballance - Pat Keenan
- Michael Smiley - Dinger
- Stella McCusker - Valerie
- Cara Kelly - Siobhan Harkin
- Valerie Lilley - Linda Corry
- Sara Dylan - Beaten Woman
- Susan Lynch - Heather Pentland
- Jonny Everett - Detective
- Sean McNamee - Intelligence Officer
- Diarmaid Murtagh - Robert Dardis
- Don Wycherley - AJ Boyd
- Vanessa Ifediora - Judith Kenny
- Vanessa Emme - Leah Hardy
- Brian Robinson - Constable Tiny
- Brian Devlin - Mr. Ford
- Elly Condron - Sandra Dardis
- Jesse Frazer - James Dardis
- Paul Garrett - Taxi Driver
- Chris McCurry - Davy
- Emma Little - Estate Agent
- Patrick Buchanan - HMSU Commander
- Lucy McConnell - Female Protection Officer
- Jane Brennan - Lauren Fitzpatrick
- Dan Gordon - Noel Timoney
- Amy Molloy - Louise Foyle
- Shaun Blaney - Stephen Foyle
- Colin Carnegie - Priest
- Geraldine McAlinden - Counsellor
- Richard Croxford - Yacht Club Secretary
- Nigel O'Neill - Chief Superintendent
- Rachel Handshaw - Agent Paula Halcrow
- Jonjo O'Neill - Ryan Savage
- Siobhan Kelly - Car Hire Agent
- Matthew Sharpe - PC Scott
- Naseen Morgan - Sadie
- Ruth Barrett
James Nesbitt hace el papel de DCI Tom Brannick.
Lorcan Cranitch interpreta a DCS Jackie Twomey en la serie.
Charlene McKenna interpreta a DS Niamh McGovern en la serie.
Lola Petticrew hace el papel de Izzy Brannick.
Chris Walley hace el papel de DC William 'Birdy' Bird.
Victoria Smurfit hace el papel de Olivia Foyle.
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