Com a revolução russa em 1917, o Czar Nicolau II e sua família foram capturados e executados, mas segundo rumores, sua filha mais nova Anastácia havia sobrevivido e vivia na Europa. Anos depois, um ex-general russo, que vive de um empreendimento fraudulento envolvendo a herança real, precisa provar aos seus investidores a existência da princesa, e se utiliza de uma mulher perturbada e sem identidade para assumir o papel de Anastácia.
Irène is the unhappy wife of a wealthy publisher, Jacques Voisin-Larive, who cares about her no more than a beautiful piece of furniture. Her meeting with Étienne, a young cabinetmaker with whom she falls in love, turns her dismal existence upside down. Not wanting to reveal her condition to her lover, she pretends to be a modest maid, employed by the Voisin-Larive. At the end of a weekend spent with her lover, Irène discovers that she is pregnant. The fragile balance of their existence is suddenly broken. Taking the initiative, she reveals her affair to Jacques and tells him about her desire to divorce. But her husband has no intention of giving her back her freedom...
