Mainland Inspector Cheng Shih-Nan (Cheng) once again leaves the Mainland with her cousin Hsiou Sheng (Cheung) to tackle a Hong Kong-related murder. They get help from their Hong Kong brethren, including the brother of Wu Kei Kuo, and the race is on to find the bad guys! But there are still many mysterious portions of Hong Kong’s capitalist culture for Shih-Nan to explore, including the wonder of karaoke!