Paul (Daniel Auteuil), a successful surgeon in the autumn of his life, becomes torn between a loving wife, Lucie (Kristin Scott Thomas), and a dangerous attraction for a troubled, mysterious young woman. As Paul is drawn further to Lou (Leila Bekhti), a cafe waitress claiming to be one of his former patients, Lucie begins to suspect her husband of having an affair, but the truth proves to be far darker and complex than she expected.