Sophie's World

The book begins with Sophie Amundsen, a 14-year-old Norwegian girl, who starts a correspondence course in philosophy after receiving mysterious letters and packages.

She is taught by the philosopher Alberto Knox, who guides her through the history of Western philosophy, from pre-Socratic thinkers to Jean-Paul Sartre.

As Sophie delves deeper into philosophy, she uncovers a complex narrative involving another girl, Hilde, and her father, Albert Knag, who is the author of the philosophical manuscript.

The story intertwines philosophy with a meta-fictional plot, where Sophie and Alberto eventually escape Knag's imagination and enter a new existence as spirits, interacting weakly with the real world.