In a Western mining town, millionaire Gordon Appleby meets Maida Madison, a civil engineer, and proposes. The two marry and return to Philadelphia, where they are coldly received by Gordon's snobbish family. Gordon's elder brother Mortimer's highbrow sensibilities are particularly offended by Maida's breezy manner, and he determines to break up the marriage. Meanwhile, Maida learns that Gordon's sister Eunice, whose husband is a lieutenant overseas, has formed an attachment to playboy Rupert Fenton. Maida decides to save Eunice when, at a party, she overhears her planning to elope with Rupert to Egypt. Late that evening, Maida follows Eunice to Rupert's apartment, where she is seen by Mortimer, who almost succeeds in convincing Gordon of her unfaithfulness. Maida refuses to explain her presence at Rupert's in order to shield Eunice, who, ashamed, confesses her guilt. Filled with gratitude, the Applebys accept their Western daughter-in-law into the family.—AFI