In Xi'an, the thousand-year-old capital, a series of bizarre murders have occurred one after another - bronze figurines borrowed their heads to claim their lives, bone flutes manipulated corpses, and Nuo-faced men summoned souls in the middle of the night... Behind each case, there are strange folk customs and unsolved mysteries buried by history.
Criminal investigation expert Yang Yang (Danniu Ge) led the team to investigate: Forensic doctor Yang Xue (Xue'er) discovered biological traces that violated common sense from the corpse; criminal psychologist Jing Jing (Jing Jing) interpreted the shadow of ancient witchcraft and Nuo rituals in the suspect's behavior; trace expert Wang Qianjin (Fat Wang) pieced together a mysterious organization called "Huangquan Chamber of Commerce" from clues at the scene.
As the investigation deepens, they discover that all the cases point to a conspiracy that spans thousands of years - the "bronze life-borrowing technique" left by the alchemists of the Tang Dynasty is being reactivated by modern technology. Active copper enzymes, infrasonic weapons, holographic projections... Ancient witchcraft is making a comeback under the guise of science. The "Yang Family Secret Volume" passed down by Yang Yang's ancestors actually records the key clues to decipher these "supernatural phenomena".
