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Sammo, wracked with guilt over Master Reng's death, seeks to avenge the murder by stepping up his own pursuit of drug lord Lee Hei. Sammo and his unit are under fire from the LAPD for failing to prevent Lee Hei from stealing a massive supply of opium, and their futures on the force are put in jeopardy. Sammo is overcome with anger at Lee Hei for causing the death of his beloved Master Reng and is resolved to stop his nemesis no matter what it takes. Determined to arrest both Lee Hei and his ruthless criminal daughter Lin, Grace confronts Lin in a brutal fight with lethal results. As sworn enemies now bent on revenge against each other, Sammo and Lee Hei engage in a final confrontation.