午马等三人为公安干警，奉命前往香港调查拐骗妇女案件，李子雄作为香港警察，负责协助调查，期间因两地文化差异，笑料百出，后来还是双方共同合作，破了此案。..

Three Mainland cops -Wu Ma and two assistants – come to HK to look for some crooks who are illegally procuring women for brothels from the Mainland. The two HK cops who are assigned to work with them are Waise Lee and Yukari Oshima. Later a Taiwanese cop also joins them and the friction between the three groups is evident – but in the end of course all three Chinas must work together to capture the bad guys!