Cheng Xu, a 22-year-old criminal police trainee, was bound to the "cold case review system" after an alarm call came from the deceased's mobile phone. The system does not give answers, but only marks those contradictions that have been ignored: the surveillance that was four minutes and eighteen seconds late, the door lock that did not lie, the ninth confession that disappeared... When the case in front of him rejoined the case of the missing girl twelve years ago, Cheng Xu discovered that the so-called perfect testimony was just a half-truth that had been carefully pieced together. The evidence doesn't lie, but the people who interpret it do. In order to find out the doubts left by his father, he must find the person who has been hiding in the investigation before the countdown reaches zero.
