After the death of her husband, killed in a duel—François de Beauharnois—Sylvie, Duchess de Fons, withdraws with her children to the family estate. But soon, the young Louis XIV appoints her to his wife’s entourage—the Spanish infanta. Before her death, Anne of Austria reveals to Louis XIV that he is illegitimate. Louis decides to get rid of everyone who knows this. His father, whose name Sylvie knows, will have to rot in prison for the rest of his days, hiding his face behind a mask. The burden of a state secret is heavy, but it is also the guarantee of Sylvie’s happiness.