Inspector Shih-Nan (Carol Cheng) together with her loyal nephew Sheng (Alfred Cheung) are on a mission to escort a dangerous criminal from the Mainland and to hand him over to the Hong Kong authorities. However, the criminal manages to escape during transportation. Disgraced Shih-Nan and Sheng are ordered by their communist superiors to co-operate with the HK police and find the fugitive. Mainland police officers, driven by the desire to redeem themselves, employ various tactics in order to find the wanted man, which results in chaotic and hilarious situations along the way.