Cyrus Drake (Leon Errol) has a problem on his hands - he's a big socialite on the verge of bankruptcy. He calls his sympathetic servants to a crisis meeting, and his loyal valet Mike O'Brien (Jack Haley) suggests that the scullery maid Millie Pico (Michele Morgan) pose as Drake's daughter, who has been out of the country for many years. As sponsor of an upcoming ball, she is sure to attract a wealthy husband who will solve all their problems. Could the wealthy nobleman Sir Victor Fitzroy Victor (Victor Barge) be the man who will save them - although he is the escort of rival debutante Katherine Keating (Barbara Hale)? But what about the relationship forming between Millie and her handsome neighbour, Frank (Frank Sinatra)?