While performing an autopsy on an unidentified woman’s body recovered from a river, Su Yi, a rookie medical examiner at the county public security bureau, discovers a strange coin hidden beneath the victim’s fingernails. As the investigation deepens, the dead begin appearing in his dreams, and the clues point to a string of murders from twenty years ago. More frighteningly, he realizes he can see the last thing the dead saw before they died, and the real killer has been hiding inside the police station all along.