One wintry Dublin morning, a hired killer unleashes a deadly ambush. His targets: a Government Minister campaigning against drugs and his medical spokesman, Dr Scott Nolan. But the attacks go horribly wrong, and in the bloodhath that follows,Scott's wife Laura is killed by a bullet meant for him.Fuelled by guilt, grief and revenge, Nolan enters into an uneasy alliance with Laura's brother, Detective Mark Higgins. Together they embark on a highly controversial covert mission to track down the assassin.