The beautiful and flirtatious Duchess of Langeais has set her sights on General de Meyran, a straight and serious man, and manages to invite him to her place alone. When the General declares his love for her, the Duchess's friends, informed, burst in. The General, thus demeaned, leaves, swearing that he will never see her again. However, the Duchess, who had fallen in love with the General, writes him many letters asking for his forgiveness but nothing happened. Years pass. The General is called to Spain by Ferdinand VII. And while he visited a Carmelite convent in Formentera, he recognized the Duchess as one of the nuns. The same evening, he tries to abduct her, to unexpected consequences.