Linjiang City has established a "cold case resumption team" to specialize in malignant old cases that have been left in the dust for many years due to lack of evidence and technical limitations. The team leader Li Shishi is full of motivation because her mother died in an unsolved case. Her first challenge is to imitate the serial killer in the "Hulan Daxia Case", but the murderer is more cunning and leaves provocative messages at the scene.
During the investigation, the DNA evidence of the new case accidentally had a weak connection with a "ritual death case" that had been silent for nearly 30 years (refer to the Chongqing Massacre Case and the Rainy Night Butcher Case). Li Shishi followed the clues and discovered that many unsolved cases - including the "headless female corpse case in the wilderness", the "bone bones case in the attic" (referring to the Jimo and Cixi cases) and many "bizarre disappearance cases" - seemed to have connections behind them, as if a pair of invisible hands were using time to cover up crimes.
As the investigation deepened, Li Shishi cooperated with forensic expert Zhou Zian, using the latest DNA technology and genealogy database to identify the suspect from the old blood prints similar to the "Fengxian Grocery Store Double Corpse Case". However, whenever they get closer to the truth, key witnesses always encounter mishaps, indicating that there may be internal resistance or a larger shadow. The main line connects multiple units such as "family extermination case", "serial disappearance" and "ritual killing", and finally reveals that all unsolved cases are related to a secret organization that uses urban legends and human fears to commit crimes and is deeply rooted in the local political and business network. Li Shishi must make a choice between seeking justice and protecting those around her, uncovering the cruel truth that spans two generations.
Purpose: When technology illuminates the dusty files, delayed justice is the only consolation for the dead and the last salvation for the living.