Michel, a young painter in poor health, enters the grounds of a château and faints when he sees a haughty young woman in the simplest of garb. The chatelaine, Eliane, takes care of him and calls in Pierre Fournier, a Parisian doctor. A disreputable Count Ostrowsky turns up to blackmail her. He is found murdered. But who's the killer? Pierre or Eliane? Quite simply Michel, who, before dying, showed his gratitude to the woman who had taken him in. Pierre and Eliane were living apart, but they were husband and wife. Such adventures unite them, this time, forever.

Nicole Montigny leaves her husband, surgeon Paul, to live with her lover in Canada. Anna, her husband's assistant, thinks she can take advantage of the situation to console the man she loves. She convinces Nicole to fake an accident. However, Paul starts seeing his wife's twin sister, Mireille. Anna, mad with jealousy, brings Nicole back and tries to break up the new couple by blackmail. Nicole decides to eliminate Anna.