Police inspector Pierre Lau and his young superior Tang Chuen Shek are ordered to cooperate with customs officer Rambo Wong to foil a drug trade. During the operation, they arrest Nakamura, a major drug lord and seize the largest bulk of drugs since the start of Hong Kong. Japanese businessman Yamamoto is the mastermind of the Nakamura Organization. Due to a large amount of drugs being confiscated and with nothing left, Yamamoto desperately decides to order his underling Siu Lung to hire some thugs from America to help him snatch the drugs at the police station to destroy the evidence so Yamamoto would not face any charges and restore the collapse Nakamura Organization.