Gifted by my bff as their favorite childhood book.
Reminded me of Narnia and Oz, with the mystery and imagination needed. The professor gave me stranger danger at first, but grew on me. I love the many examples of how you can use your imagination to get through anything. I.e. bullies, hard times. The writing style is not a favorite, but it works well and simple for children. Challenge them to look up more, observe more.