This is without a doubt one of the most interesting books I've ever read.
Sophie learns from her philosophy tutor, Alberto, and we learn alongside her about the history of philosophical thought while also witnessing the strange developments in her life which start happening after she starts her philosophy classes.
It's as important as ever for us humans to be asking ourselves the questions which Sophie herself has to face throughout the course of this book.
There's also a very interesting twist at the end.
Loved it!