At the age of thirty-five, Fanny van de Grift Osbourne leaves her philandering husband in San Francisco and sets sail for Belgium to study art, with her three children and a nanny in tow. Not long after her arrival, however, tragedy strikes, and Fanny and her brood repair to a quiet artists' colony in France where she can recuperate. There she meets Robert Louis Stevenson, ten years her junior, who is instantly smitten with the earthy, independent and opinionated belle Americaine.