Zhang Jiuling is the youngest head catcher in Dali Temple, and he solves crimes like a god. During the period of Empress Wu, secret room murders occurred one after another in Luoyang. The victims were all important officials of the court, and a copper coin was left at the scene. He traced the copper coins to a secret organization called "Bad Persons" - an intelligence agency established during the Taizong period that had long since been abolished. But someone is using this name to purge dissidents, and the manipulator behind the scenes is the most favored Princess Taiping in the dynasty.
