In the autumn of 1036, during the reign of Emperor Renzong of the Northern Song, a strange case occurs in Kaifeng Prefecture: a military deployment map has been stolen. Yang Yanzhao, the great marshal guarding the frontier, also known as Sixth Brother Yang, is ordered to return to the capital and assist Kaifeng Prefect Bao Zheng with the investigation. On the way back, someone tries to assassinate him...
