Using the old case of Lin Chen's father who died in the line of duty as a hidden clue, 10 independent and related serial murder cases were connected in series. Lin Chen led the team to solve each bizarre murder case. In the process of arresting the real murderer, they gradually unearthed the truth about his father's death in the line of duty, and finally uncovered the protective umbrella hidden behind the police force and the evil forces, completed the closed loop of justice, and grew into a unique and leading criminal investigation.
