Innocent country girl Millie arrives in Twenties New York determined to vamp it up and become ‘thoroughly modern’. She instantly marks out her new boss, Trevor Graydon, as a future husband, makes a new friend in the innocent Miss Dorothy and takes rooms in an establishment run by Mrs Meers – unaware that the latter is in fact a white slave trader! When Mrs Meers attempts to abduct Miss Dorothy, Millie calls upon paper clip salesman Jimmy and high society jazz babe Muzzy for help.