Passion de femmes (1955)

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.