In an ancient and remote town, Luoyu Town, several bizarre murders occurred in succession. A strange musical score was left at the scene of each case, as if telling some hidden secret. Lin Chuan, the only police detective in the town, is a man of few words but with keen intuition. He investigates these seemingly unrelated cases alone.
During the investigation, Lin Chuan met Ye Qingyang, a reclusive musician in the city. Ye Qingyang's works are mysteriously related to the music score at the murder scene. Lin Chuan was deeply involved in the mystery, but at every step of the investigation, he discovered that there seemed to be an ulterior historical truth hidden behind the music score.
At the same time, a mysterious man who calls himself "Night Shadow" frequently appears in the homes of those involved in the case, seeming to be controlling everything secretly. Can Lin Chuan break through the fog and find the real culprit in this psychological game? Or will he become Night Shadow's next prey in this dangerous chase?
