A police detective and his female companion kidnapped a 13-year-old runaway girl and forced her into prostitution with 20 men at private parties, the authorities said on Wednesday.

The detective, Wayne Taylor, 35, and his companion, Zalika Brown, 29, of 173-37 Vaswani Avenue in Jamaica, were charged with kidnapping, unlawful imprisonment, endangering the welfare of a child and promoting prostitution, said the Queens district attorney, Richard A. Brown. They were arraigned in Queens Criminal Court on Wednesday night and pleaded not guilty.

The girl left her home in Brooklyn on Jan. 10 and encountered someone identified only as Drama who offered to find her a job dancing at parties and introduced her to Ms. Brown, the police said.

Ms. Brown told the girl that she had been “purchased” for $500 for use as a prostitute and introduced Detective Taylor as her husband, the police said, although they described the couple as boyfriend and girlfriend.