The young historian Elisabeth is traveling to Lyon on her own in order to explore the city tracing the life of Flora Tristan. Tristan, whose diary Elisabeth is carrying, was a 19th century socialist and feminist who influenced many contemporary activists and intellectuals yet fell into oblivion herself. Elisabeth tries to put together the clues she can find in Lyon wanting to reconstruct Tristan's life in the most sensual way.
In the fall of 1963, Anne is becoming a teenager. She lives in Paris with her mother and her older sister, Frédérique. They're just back from summer at the beach with their father. School starts. A turbulent year awaits them both.