Haunted by a botched police investigation five years earlier, former policeman Zhang has retired to a distant mining town in Northern China in an attempt to drink his past away. But when a new string of murders unfold in strikingly familiar fashion to the old case, Zhang sees a chance to atone for the sins of his past. A one-man investigation team, he vows to unearth the brutal killer at all costs, and his journey takes him down a dark road from which there is no return.