Genevieve is Isabelle's older sister. Although her family expects her to marry Victor, a general of the French army, she falls in love with the piano teacher Jules. Genevieve's father disowns her after finding out about the affair and she gives up her title and wealth in favour of living together with her true love. 

In France, during the 19th century, 15-year-old Isabelle Laustin, a noblewoman, officially enters the world of the aristocracy at a ball in Versailles. But shortly after, the French army is defeated at Sedan, and Isabelle and her family have to leave their mansion to take refuge in Paris, where they will take an active part in the fight against the Prussians. 

Genevieve Laustin