Pampered Amy Burke lives in a New York mansion with her wealthy grandfather, Alexander Guthrie. She upsets him when, on the eve of their planned trip to Europe, she decides instead to live with her returning father, a sociologist, in an East Side slum, where he can make observations for a book. Although at first she is disgusted with her new surroundings, Amy gradually learns the joys of shooting craps, dancing the shimmy, and escaping from the cops. After she befriends John Graham, and learns that he had gone to jail because financiers headed by her grandfather made him the scapegoat for their improprieties, she disguises herself as a boy and with John breaks into her grandfather's safe. They are caught after finding papers which clear John's name. Amy's grandfather, who earlier, disguised himself to check on Amy and softened while observing her, promises to right the wrong. Amy and John marry and escape rice-throwing well-wishers by switching autos.