In the late autumn of the Bingwu year, on the eve of the New Deal Conference in the Summer Palace, the imperial seal disappeared, and the military minister Bao Jun died suddenly in a secret room. Prince Rui Zaijun was ordered to solve the case in three days, but he encountered murder cases one after another - the staff fell into the water, the chief executive "hanged himself", and the students were poisoned. As the investigation deepens, a major case of military embezzlement five years ago comes to light, revealing the deepest secrets in the palace. When the truth finally came to light, the supreme power buried everything with an edict. This is a historical mystery novel about justice, revenge and the evil of the system.