When oil magnate Thomas Waring receives a letter from his old friend, Mrs. Juliet Smith, suggesting that his beloved daughter Maida spend her vacation at Mrs. Smith's island home, Waring encourages Maida to accept as he has to go East on business. After Mrs. Smith supposedly gets Maida, Waring receives a call from the real Mrs. Smith, who says that Maida has left with an impostor.

Although her husband and children want to continue living modestly after they acquire a fortune from munitions, Mrs. Tompkins has social aspirations and persuades them to move into an exclusive country neighborhood and send their son Dick to Yale. When Mrs. Tompkins mistakes Louise Allenby, the daughter of her aristocratic neighbors, for a maid, Louise in jest pretends to be the Allenby social secretary. Dick, returning home, hears some girls giggling about Louise's joke on the Tompkins family and for revenge he becomes a groom for the Allenbys, but he and Louise fall in love. During a party, swindler Cholly Van Dusen steals some of the Allenby jewels and blames Louise who is put under arrest until her parents return. Cholly is then caught, Louise and Dick with revealed identities announce their love, and the Tompkinses are accepted socially.