During the Jiayou period of Renzong in the Northern Song Dynasty (1056-1063), Bianjing (Kaifeng) was the capital. On the surface, singing and dancing were prosperous and the market was prosperous. Wrestling with ministers and factions such as Ouyang Xiu), intertwined conflicts between civil gentry and poor families, with the Xixia and Liao dynasties looking eagerly from the outside, and the intertwined forces of the Jianghu within, providing a complex foundation for suspense cases. The mystery of the "Canglong Secret Key" runs through the five volumes - it is said to be a secret treasure left by Taizu Zhao Kuangyin, which is related to the survival of the Song Dynasty. It not only hides the secrets of the early years of the founding of the People's Republic of China, but also involves the power struggle in the contemporary court. The cases in the five volumes all revolve around the clues of the "Canglong Secret Key", which ultimately point to a conspiracy to overthrow the dynasty.
