Two consecutive homicide cases occurred in the Longshan area, causing huge repercussions in society. The people are in fear and the pressure put on the police is increased sharply. So, a “118” special task force is immediately established, with Li Hui, the deputy director in charge of criminal investigation, and Guo Ming, the captain of the criminal investigation team, serving as the main and deputy leaders. Li Hui, who is about to retire in around ten days, is determined to solve this case before retirement to bring his lifelong career in criminal law to a perfect end. However, behind the two seemingly unrelated homicide cases lies a meticulously-designed conspiracy, and the situation is shrouded in mystery. In order to obtain a huge fortune and frame her half-sister Liu Yu, the jealous and resentful Liu Xinxin frequently switches between the identities of Liu Yu and Liu Xinxin. The new and old criminal policemen let go of their past grievances and join forces to investigate, ultimately resolving the mystery.