Zhè bù diànyǐng jiǎngshù le yī gè nǚfàn yuèyù de gùshi.
The film tells the story of a female convict's prison escape.
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女犯 is a formal/legal term (parallel to 男犯, male convict) used in courts, prison records, and news reports. In casual speech you'd say 女囚犯 or 女罪犯. Originally an imperial-era term, it remains in modern legal usage.