Garda Detective Tadhg Sullivan leads a special unit that investigates politically motivated crime. A man known only as The Deerstalker is a cancer who has infected the Irish political system.
Sullivan teams up with journalist Helen Carty, and together they try tracking down the mysterious killer. Carty adds to Sullivan’s problems, when he finds himself falling in love with her. And further complicating things, he starts losing trust in his partner, Detective Pat Carter, who appears to be on the side of the Garda Commissioner, who Sullivan is rapidly falling out with.
Sullivan’s case is further thrown into confusion when a copycat killer, Tommy Walsh, is shot dead by the CIA. When the CIA discovers that they've killed the wrong person, the two agents involved--Simon, who has become disillusioned by his time stationed in the Middle East, and Joey, a psychopath who confuses zealotry with patriotism--are also in pursuit of The Deerstalker.
Sullivan finds himself in a race against time, if he is to arrest The Deerstalker before the CIA take him out, and use his death as a pawn in a political game of chess.
Who will win out in the end?