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The Naughty Duchess was the come-on title affixed to this filmization of the novel Indiscretion of a Duchess (apparently "naughty" was easier to spell). Eve Southern plays a woman with a shady history who tries to elude the Law by boarding a train. Here she begs handsome fellow-passenger H.B. Warner to pose as her husband to throw the cops off the trail. It so happens that Warner is a duke, who is so charmed by the breathless Southern that he asks her to become his duchess. The girl tries to live up to her new title and responsibilities, but she finds it difficult not to lapse into her old low-born shenanigans.