Plot: A Hong Kong police officer, Ka Kui is sent undercover to mainland China to break up a drug smuggling ring. After breaking the brother of the drug lord out of prison, he and another agent (a beautiful communist policewoman) are taken to Hong Kong to work for the syndicate. The wife of the crime boss has been arrested in Malaysia for drug trafficking and is soon to be executed. However, she is the only person who knows the account number of a secret Swiss bank account containing millions in drug money. While the two officers are in Malaysia preparing for the jail break, Ka Kui accidentally runs into his girlfriend May, who has traveled there from Hong Kong. Soon his cover is blown, the criminals kidnap his girlfriend and he is forced to help them pull off the jail break.
Alternative Plot: To infiltrate a drug cartel, police Inspector Chan Ka Kui (Jackie Chan) goes undercover in a Chinese prison. There, he earns the trust of Panther (Yuen Wah), a cartel member, by breaking him out of prison. With the help of another undercover agent (Michelle Yeaoh), they travel to Hong Kong and join up with Panther's gang. Ka Kui is accepted by the gang's leader (Ken Tsang), but his operation is jeopardized when Ka Kui's girlfriend (Maggie Cheung) accidentally reveals his true identity.
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