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Nine years ago, Tang Qiu, a well-known domestic detective, suffered from severe depression after solving the July 19 serial murders 15 years ago. No one knew the reason. At the beginning of summer, Tang Qiu's student Qin Ke came to City A to collect materials for his detective club, and happened to come across a murder case. Because of the friendship between the criminal police captain and his teacher Tang Qiu, he was invited to be the criminal investigation consultant for this case. The criminal police team discovered a sealed rotting corpse at the scene of the first crime. The forensic doctor determined that the corpse had been dead for more than a month. During the investigation, missing persons were discovered one after another. What is the connection between them? Is this murder related to the July 19 case 15 years ago? What kind of truth is hidden behind the confusion? Under Qin Ke's investigation, the fog is being lifted bit by bit...