When Matt and Amy Dale separate, their son, Matthew, is put in an English school and kept in ignorance of his parents' identities. As he grows to manhood, reflections on his paternity increasingly obsess Matthew, and he finally goes to Paris in search of information about his family. There he meets Bricotte, a girl of Montmartre of questionable morals. News of Matthew's late hours and his heavy drinking reaches his father, who comes to Paris and introduces himself to Matthew as a friend. The elder Dale arranges to have Bricotte in his own apartment when Matthew arrives, causing Matthew to suspect her of cheating on him. Matthew's mother is also in Paris, changed by the passing years. Matthew meets her, and she uses her feminine arts to vamp him. They are discovered by the elder Dale, who reveals to Matthew both his own and his mother's true identities. Matthew attempts to commit suicide but is saved by his father. He returns to England and marries Margo, his fiancée. Matt and Amy Dale are reunited for their twilight years.