Northern Ireland, 1973: Amid the bombs and the bloodshed, a serial killer stalks the streets of Belfast. He selects his victims according to a verse in the “Codex Gigas", also known as “The Devil’s Bible”. When British authorities prevent the local police from investigating these brutal and bizarre satanic slayings, it takes the unlikely union of a Protestant detective, a Catholic Priest and an underground paramilitary fighter to pursue the psychopath and stop the slaughter. But they soon discover that this killer has a darker purpose and the murders are part of a far more sinister game.