An unsolved disappearance case has become a lingering shadow in the mind of retired criminal police officer Shangguan Jiang Shuo. When he returned to the Arashiyama City Police Department as a consultant after many years of absence, this seemingly peaceful town was shrouded in a series of strange serial murders. The scene was shockingly clean, there were no clues, and the circumstances of the deceased's death were even more unbelievable. For a while, people were panicked and rumors spread.
Faced with the helplessness of his juniors, Shangguan Jiang Shuo relied on his deep-rooted acumen and decades of criminal investigation experience to partner with Lin Wan, a young and energetic policewoman new to the police force. The two searched for connections from clues and dug into the truth amidst layers of fog. As the investigation deepened, they were shocked to find that the root cause of this serial murder case actually pointed to the "8.15 Disappearance case" that made Shangguan Jiang Shuo regretfully retire many years ago. It also involved the local shady case that had been entrenched in Lanshan for a long time and the heinous crimes that were deliberately covered up.
The cunning murderer secretly observed their every move, even setting traps and issuing provocations. Shangguan Jiang Shuo and Lin Wan must break through numerous obstacles and start a thrilling psychological game with this highly intelligent criminal. When all the pieces were put together, a truth that had been sealed for more than ten years finally emerged.
