The criminal investigation notes were stolen, which not only contained evidence of police corruption, but also involved the unsolved case of family murder ten years ago. Su Tang must get back the notes within a month, otherwise the real murderer will always be at large. Zhou Yanan secretly obstructed the case, Ding Xiaomei brought clues to the old case, and lawyer Gu Lan's defection became the key to solving the problem. Chen Mo's hacking skills help her tear apart a corner of darkness, but approaching enemies and internal betrayal make this pursuit a life-or-death situation. When the last page of notes was burned, Su Tang discovered that the real opponent had never left the police force.
