A model by day and a short-story writer by night, Erminie Foster is insulted when novelist Ernest Sanford visits her display room to study her as a "flapper" type. Later, Erminie attends a reception uninvited to gather atmosphere for a story. Sanford saves her from being thrown out by saying that she is his cousin. When her prudish aunt forbids her entrance at 3AM, Sanford offers her lodgings under the protection of his housekeeper and soon persuades her to stay for inspiration. He writes a satire on women that is turned down, while hers on men sells. After Erminie overhears Monte Ralston, who loves Sanford's fiancée Helen Reeves, threaten Sanford with Helen's incriminating letters, Erminie sacrifices her reputation to retrieve the letters. When the engagement is broken and Helen and Monte explain Erminie's behavior to Sanford, he loses his smugly superior attitude and confesses he loves Erminie.