Nathan Black had two great loves: Jason Leonard and himself. The former was taken from him by a sniper's bullet in Belfast, a deed for which he would exact unparalleled retribution. Driven by rage and his own thirst for revenge, he sets out on a quest of brutality never before witnessed in the beleaguered province of Ulster. By murdering the families of known terrorists, his intent was to make those responsible for Jason's death understand what it really feels like to lose the only thing that one has ever loved.

A series of barbaric murders holds the enclave in a grip of terror unequalled in its troubled history. With the local constabulary seemingly clueless and the murders becoming more frequent, the heads of both warring factions agree to a cease-fire. In an unprecedented move, they decide to unite two of their most accomplished operatives. Their goal is the apprehension of the killer known as the Preacher.

Can two sworn enemies put their differences aside for the common good? Or would hundreds of years of bigotry stand in their way? With the knowledge that either man could betray his trust, they set out on the arduous task. Their mission sets them on a collision course with the most feared man in Ireland.