Unaware of the ugly secret buried in the land he is hired to map, engineer Richard Markey stumbles into the middle of Northern Ireland's violent and lethal past. When he chances upon the long dead body of an alleged informer, the discovery whips up old hostilities to a fever pitch, setting off a chain reaction of treachery, bloody violence and relentless pursuit. Now marked for death, the mapmaker must either run or fight back to save his life.