Plot Summary:A group of illegal immigrants escape from China to Hong Kong, but are taken advantage of by the locals: the only girl in the group is raped by a member of the gang that helped in their escape, and her Elder Brother and the others are paid 20% of the wages in their hard tasks. Unnable to survive on their honest works, they switch to petty crime: shoplifting, bill shirking, and pickpocketing. The good girl and impressive pickpocket shows off the kung fu her mother taught her, and picks the Chief Detective's pocket, just as he was looking for a new mole to infiltrate the criminal Eagle's gang. The immigrants are reluctant at first but are convinced to cooperate with the Police with the promise of not being deported to China. Besides, the No. 1 hit-man of the Eagle Gang is the same man who raped Hsiao on her way over to Hong Kong, and the girl is determined to settle the score out of the courtroom. The infiltration goes so well that Hao, the Eagles' Boss, gets interested in the girl, which arises jealousy in his rough Mistress. That leads to a great fight between the women - first the girl versus two henchwomen lightly dressed in red outfits in a bedroom, and then the girl versus the Mistress in a leopard-print gown in a bathroom and into a round pool. The girl wins, and so do the cops who arrive just in time to prevent her to commit murder.
藍小蝶、方玉書、查龍、張寶亮四人自大陸偷渡來港,不幸落入黑幫手裡,小蝶更遭黑頭胡匕強暴。 四人終逃脫黑幫掌握,在市區以偷、騙維生。警方陸探長為偵破「鷹」幫黑社會集團,逼令小蝶等作臥底,眾人運用機智大展身手,幾經凶險,終於得到機會,會合探長等大破匪窟。