A rainy night. A female corpse. Forensic pathologist Lin Xi freezes at the autopsy table: the crescent-shaped scar on the inside of the dead woman's left pinky is identical to the one on her friend, who was murdered fifteen years ago.
One case leads to another. A button, a photograph, a person who always hides behind the camera. He photographs every murder, records every victim, and has been photographing her for fifteen years.
When Lin Xi finally faces the truth, she understands: all these years, the one she has been pursuing isn't the killer, but a pair of eyes that have never stopped watching her.
This time, she decides she won't be the one merely being watched.
