Before Hong Kong's return to China, the gangster Long Zhiqiang took advantage of the inaction of the British government in Hong Kong and committed many crimes. He kidnapped the eldest sons of the wealthy Li Jia and Lei Jia and extorted more than 2 billion yuan. The victims were afraid of retaliation and did not dare to call the police after paying the ransom. The Ministry of Public Security of China paid great attention to this and worked with the Hong Kong police to send Hong Kong police officer He Tian to infiltrate Long Zhiqiang's criminal gang and found that he was planning to kidnap Macau tycoon He Bufan. In the end, the mainland and Hong Kong police worked together to capture Long Zhiqiang and rescue He Bufan.