While investigating a missing-person case, criminal investigator Lin Xingwan stumbles upon a sacrificial ritual deep in the mountains. Her flashlight falls on the idol, revealing the imprint of a police badge. Her partner, Shen Mo, realizes it matches evidence from a family massacre twenty years ago, but veteran detective Zhao Gang repeatedly obstructs their investigation. Su Chan, a cult’s holy maiden, secretly passes along a clue, while Li Xiuzhi, the victim’s mother, risks everything as she clutches a ledger. When the hypnotic suggestions of psychiatrist Bai Jingchen come to light, Lin Xingwan finally realizes that everyone is a pawn on the board, and the number on the badge leads to a revenge long delayed.
