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Cynthia Yang Li-chang stars again in this fourth installment of the popular series directed by Yuen Woo-ping. The film opens with straight arrow American longshoreman Luk Wan-ting (Yuen Yat-chor) stumbling into a police raid, in which he gets blamed for a DEA agent's death. Now a murder suspect, Luk flees to Hong Kong with Madam Yeung (Yang) and street cops Donny (Donnie Yen Chi-tan) and Michael (Michael Wong Man-tak) in hot pursuit. When they finally catch him, Luk is shot by a shadowy assailant before he is extradited. As Luk is the lucky survivor of one assassination attempt after the next, Yeung begins to suspect that Michael isn't necessarily on the side of the law. As it turns out, he's a CIA agent selling drugs to the inner cities to finance terror campaigns in Central America.