Circle of Passion revolves around the main character, Thomas (Charles Finch), who takes a high-powered financial job in France working for his father-in-law. His wife Amanda (Jane March) dislikes Paris and chooses to stay in London where she lives a privileged life, keeping up with high fashion and society's expectations. In Paris, Thomas works long hours in a tedious job and spends most of his time alone. While driving through the French countryside, Thomas rescues and eventually falls in love with a carefree French woman, Katharine (Sandrine Bonnaire), whose personality dazzles him. She offers him adventure and pleasure; unlike his uptight, high-maintenance wife. When Amanda finds out about the other woman, she is jealous and resorts to desperate measures, deliberately endangering her own life in order to prevent him from leaving her. Thomas is forced to make a difficult decision and choose between his happiness and his obligation to his wife.