A ship sailing in the pre-First Opium War South China Sea is attacked by pirates and five British people maidens on board are kidnapped. They are sold to a brothel run by Chao (Hsieh Wang), starting to get trained in sexual techniques for the day when they shall be auctioned. However, one of the attendants, Ko Mei-mei (Lau Wai-Ling) takes pity at the girls' fate and, with her brother Ko Pao (Elliot Ngok credited as Yueh Hua), begins to secretly instruct the girls in kung fu. Meanwhile, a romantic liaison between Pao and one of the girls, Dawn (Sonja Jeannine) emerges.