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An exuberant performance by Sharla Cheung as the masked superheroine Nightingale Wong enhances this otherwise standard low-budget Hong Kong fantasy from director Taylor Wong. Unlike most masked heroines in this distinctly Asian subgenre, Nightingale actually enables gangland activities. She comes to Hong Kong from the United States to help her adopted father, the triad gangster Yip (Kwan Hoi-Shan), deal with his backstabbing second in command, Jaguar Lui (Ken Lo). The meeting is rigged as a trap, however, and a gun battle ensues which leaves Nightingale with amnesia and her foster father dead. Two madams -- a mother and daughter played by popular actresses Deanie Yip and Chingmy Yau -- find her and nurse her back to health. They believe that the amnesiac woman is the missing daughter of a millionaire who is offering a lucrative reward for her return, and in order to keep Nightingale around, they convince her that she is a prostitute in their employ. Eventually, Nightingale runs into Jaguar Lui at a nightclub and gets her memory back. She gets her revenge against him and his men in the end, aided by Yau's boyfriend, a former triad assassin called Big Nose Fu (Jacky Cheung).