Some 40 years ago when warlords rode rough-shod over the Chinese people, circus acrobat Pao Te-cheng took to the hills and began robbing the rich to help the poor. His daring feats earned him the nickname of "The Masked Robber�. Trying to intercept a large sum of money to be turned over to public security chief Cheng Kuan-hsi, he is nearly caught. Partner Hsiao Chung is jubilant over his safe return. But in the government office, chief detective Ma Pu-yun frantically plots his arrest. Ma Chien-li, son of the chief detective, devises a clever trap set for Ma Pu-yun's birthday party. Among the guests is Huang Tan-ping who is engaged to Doctor David Lee. Ma Chien-li proposes to her without knowing this.