In the late Qing Dynasty, the assistants in Upper, Central and Western Districts, known as the "Three Rings of Town", secretly colluded with the Western District bully Gou Xinhu, and the public security in Western District was in a mess. After being ordered to take over Western District, police officer Ma Rulong (Jackie Chan) quickly arrested Gou Xinhu and put him in jail, which aroused the resentment of the "Three Rings of Town". At that time, the revolution in the mainland was surging, and the revolutionaries came to Hong Kong to spread propaganda and planned to rescue the arrested comrades. In order to catch all the revolutionaries, the Qing court sent secret envoys to contact the Three Rings of Town. Ma Rulong got to know Bai Yinghong, Yingying, Shanshan and other revolutionaries (Maggie Cheung, Rosamund Kwan, Carina Lau, etc.) and was also involved in the vortex of struggle. At the same time, a group of pirates with strong limbs and simple minds were waiting for an opportunity to take revenge on Ma Rulong.