In the winter of the eleventh year of Shaoxing, medical student Yue Yun was electrocuted to death in the library. When he opened his eyes, he had become Yue Shaobao on the eve of the Fengbo Pavilion execution. The shackles around his wrists bore the imprint of Beihai Xuanci, and every bloodstain was a navigation code to Lin’an’s underground waterways.