One day fourteen-year-old Sophie Amundsen comes home from school to find in her mailbox two notes, with one question on each: "Who are you?" and "Where does the world come from?" From that irresistible beginning, Sophie becomes obsessed with questions that take her far beyond what she knows of her Norwegian village. Through those letters, she enrolls in a kind of correspondence course, covering Socrates to Sartre, with a mysterious philosopher, while receiving letters addressed to another girl. Who is Hilde? And why does her mail keep turning up? To unravel this riddle, Sophie must use the philosophy she is learning–but the truth turns out to be far more complicated than she could have imagined.
Sophie is the survivor of Nazi concentration camps, who has found a reason to live in Nathan, a sparkling if unsteady American Jew obsessed with the Holocaust. They befriend Stingo, the movie's narrator, a young American writer new to New York City. But the happiness of Sophie and Nathan is endangered by her ghosts and his obsessions.