A nightclub hostess is about to be raped, with the club patrons looking on and applauding (including women). Two tough women charge in, kick the bad guys butt, then castrate him. Shen Nan and Wong Fu Nam then roar off on their motorbikes. They are caught by a CID officer, with whom they have a very long moral discussion about police versus vigilantes. He lets them go.
Annie is being beaten by her husband Dai Chuen, because she won't consent to sleep with his boss David. Nan and Nam rescue Annie, and Annie joins their (all female) gang.
David works for a drug smuggler, and the women learn of his shipment. Thus, the police and the women go after the baddies, but the baddies see only the women as a problem.