In the third year of the Xuanhe reign of the Northern Song Dynasty, Bianjing was hit by a heavy rain that had never happened in a century. The case of floating corpses in the Yellow River led to the corruption network of the "Hua Shi Gang" of the powerful Prime Minister Cai Jing - and the key to solving the case was hidden in a draft of "Along the River During the Qingming Festival" that was about to be submitted to Song Huizong. It was a coincidence to see how the protagonist walked towards the "truth" step by step.
