During the reign of Emperor Renzong of the Northern Song, Shen Qing, a young man from Luzhou who cannot fight but has a photographic memory and a genius for deduction, meets Zhan Hongling, a heroic woman of the martial world and the younger sister of the Imperial Cat Zhan Zhao, and Gongsun Ce, a down-and-out constable who was demoted from his post at the Kaifeng Prefecture for dereliction of duty, while investigating the "Ghost-Faced Killer Case." The three team up to solve one strange case after another, only to stumble upon a shocking secret from twenty years ago: the cat-swapping plot to replace the Crown Prince. And Shen Qing’s origins turn out to be the most crucial piece in this game of strategy.
