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The rainy season in Linjiang City is soaked with sin. When the third female body was recovered from the drainage ditch, forensic doctor Ye Zhiqiu smelled the unique smell of preservatives from his father's laboratory in the diamond-shaped bruises on the deceased's wrist. Twenty years later, the memory of the rainy night when her mother was killed by domestic violence was still eating away at her nerves - until it was discovered that all the victims had a missing pearl from their earlobes, with Caravaggio's famous beheading painting engraved on the surface. Damp vices thrive in the rain. The psychopathic hunter, the tampered autopsy files, the luminous orchids grown from the ashes of the victims, all the clues are tied together in the key-changing chapter of the piano song "Moonlight". When Ye Zhiqiu reproduced the chemical scars of the murderer's torture of the victim in the laboratory, Lin Xiuyuan smiled behind the surveillance screen. In the photo in the inner pocket of his white coat, a boy in school uniform was witnessing Ye Zhiqiu's mother being dragged into an alley in the rainstorm...