It's 1989, and in a Belfast torn apart by conflict and terrorism, petty criminal Marty McGartland is recruited by the British police to infiltrate the IRA. Guided by Special Forces officer 'Fergus', McGartland gains unparalleled insight into the organisation's dealings, providing his British handler with priceless, life-saving information. Based on a true story.

Ben Kingsley
as Fergus

Jim Sturgess
as Martin

Kevin Zegers
as Sean

Natalie Press
as Lara

Rose McGowan
as Grace

Tom Collins
as Mikey

William Houston
as Ray

Michael McElhatton
as Robbie

Laura Hughes
as Mary

Gerard Jordan
as Kieran