As the film opens, it's 1954 and Sagan, still in her teens, has become a literary celebrity overnight with the success of her first novel Bonjour Tristesse. Sagan is enjoying the high life with her close friends Jacques Chazot and Bernard Frank, while spending her royalties on liquor, sports cars, partying and evenings at the casino. Sagan, a bisexual, enjoyed short-lived romances with lovers of both genders but in the Sixties she made an effort to settle down, marrying American expatriate Robert Westhoff.