France, 1950s. From the Quartier Latin to Saint-Tropez via New York, a young Parisienne becomes the icon of a whole generation. In 1954, 19-year-old Francoise Sagan shot to fame with her first novel, Bonjour Tristesse. Flamboyant, scandalous and underrated, Sagan lived her life at the furthest edge of excess. She won…