The film centers around a Malaysian pharmaceutical company using a new virus to generate an epidemic. A secret organization, known as “The Leaker”, discloses this information. After the suicide of the pharmaceutical company’s son and a local reporter, the wife of the pharmaceutical company’s owner leaves for Hong Kong. A Malaysian police chief , Hong Kong police officer, and journalist work together to locate her whereabouts.

A Hong Kong cop named Kit busts a major gangster only to find his cover blown and his main witness gone. The gangster, in retaliation, has him kidnapped and put in a Thai jail with a false criminal identity. A lowly prison guard Chai with extraordinary fighting skills guards kit and prevents his escape from prison. The prison guard’s daughter suffers from a rare form of leukemia and Kit is the only donor who can save her. The prison guard discovers Kit’s real identity and helps him to escape in return for his agreeing to save his daughter. Together, Kit and Chai must face the gangster and his minions and take them down.