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Introduction to the book Lu Chen, a former criminal investigation cadre, voluntarily quit the police force due to an unsolved case of a girl's disappearance three years ago. He lived in seclusion in the old city and opened a private investigation firm that no one cared about. He only believed in every tiny trace left at the scene. When a series of strange private house cases appear one after another that seem to be independent but extremely horrifying, a black hair, a mud mark, a smell, a misplacement... All the small traces quietly point to the rainy night three years ago that everyone deliberately erased. The truth is buried in the sea of ​​​​people, and the murderer is hidden in the daylight. With his mortal eyes, Lu Chen chased all the remaining traces and broke the city's silence in the serial murderous situation.

The girl originally lived in seclusion in the mountains and forests and did not care about worldly affairs. She accidentally rescued a swordsman who was seriously injured and had amnesia, and the two traveled together. Along the way, they trace the young man's life experience and uncover the dusty conspiracy in the fairy world. The fate of good and evil in the past is before their eyes. The two make a difficult choice between grudges and love.