Modern criminal policeman Chen Fei traveled back to Jiayou three years in the Northern Song Dynasty and possessed Zhao He, a prisoner in Xiangfu County. He has no power and only relies on modern criminal investigation knowledge to investigate cases in the market. Serial cases of unknown corpses occur frequently, officials push the blame and clues are cut off. He investigated secretly and found that the hidden mark on the body was related to the water transportation gang. With the help of fingerprints extracted from plant ash and shoe prints drawn from hemp paper, the real culprit was gradually identified. Refugee informants, secret messages in calligraphy and painting, and collusion among subordinate staff emerged one by one. He dealt with the suspicion of the boss and the suppression of the powerful, and finally solved the murder case and brought out the smuggling gang and official corruption case. The truth is approaching, the mystery of the inkstone is revealed, and the secrets of the royal family are revealed. He chose to stay and keep peace with the law.
