Paris, 1889. Hoping to give her baby a better future, Rose leaves the Morvan region to become a wet nurse for a wealthy bourgeois family. There, she meets Odette, a midwife who warns her that a wet nurse cannot keep her own daughter with her. A risky solution presents itself: secretly swapping her daughter with that of Hélène de Gersande, a mother devastated by the sudden loss of her infant.