Before the return of Hong Kong, the fierce bandit Long Zhiqiang took advantage of the inaction of the British government in Hong Kong to commit major crimes. He successively kidnapped the eldest sons of the rich Li family and the Lei family 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 money. China's Ministry of Public Security was extremely concerned and joined forces with the Hong Kong police to send Hong Kong police officer He Tian undercover to sneak into Long Zhiqiang's criminal gang. He was discovered that he was planning to kidnap Macao tycoon He Bufan. In the end, the mainland Hong Kong police joined forces to capture Long Zhiqiang and rescue He Bufan.