It reflects the story of 1997, when the police of Chinese mainland and Hong Kong joined hands to form a strong police network to crack down on criminal activities. The Major Crimes Unit of the Hong Kong Police Station received a report that bandits attacked the jewelry factory. In the ambush, both sides suffered casualties, and the bandits finally escaped and sneaked back to the mainland. With the investigation of the case, the police discovered drug trafficking and robbery. A series of criminal activities, such as smuggling and kidnapping, are all committed by a big black country in collusion with China, Hongkong and South China cities in China. The head of Heizhou is He Zhonghao, a small businessman. Chen, the captain and deputy captain of the investigation brigade of the hacking case of China Nanhua Public Security Bureau, was appointed by the superior to cooperate with the Hong Kong police in solving this series of major cases. In the process of handling the case, the police of the two places have continuously exchanged information, established good cooperative relations and won one victory after another.