Plot synopsis: Orphan Mary Lord, the ward of Sir Arthur Stanhope of Parliament, is attracted to Philip Carmichael, a young politician, who ignores her and goes through a supposedly mock marriage at a wild party with actress Sheelah Delayne. Years later, Philip falls in love with Mary, now married to Sir Arthur, who dies from a stroke when he sees Philip and Mary together. Remorseful, they try to keep apart but eventually marry in France. Later, Sheelah confronts Philip with their son and proof that they are married. When Philip is arrested for bigamy, Mary testifies, to her humiliation, that she and Philip are not married, and then disappears. After her son dies, Sheelah goes to France as a canteen worker and finds Mary wandering in a daze. Feeling pity, Sheelah has her marriage annulled and sends for Philip. When Mary hears soldiers sing a song she used to sing to Philip, she recognizes Philip and they resume their marriage.