It's an international bestseller which for some reason I had never heard of until suddenly I found it on my library holds list (I don't remember placing it there but I guess one night I was cruising the library website half asleep). It's translated into English from Norwegian so that might be why it caught my eye (Remember my obsession with Swedish translations? I'm branching out.) or it could be because it's a book on philosophy. I had little to no knowledge about the great philosophers of the past or even what it meant to be a philosopher. I can happily say that is no longer the case. Not only did I learn about it but I experienced what it means to think philosophically...and I may have had an existential crisis as a result. The book starts out with Sophie who discovers a letter in her mailbox asking her questions such as "Who are you?".  It snowballs into packets of lecture notes and suddenly she finds herself enrolled in a philosophy course with a professor who prefers to remain hidden. I don't want to give any more away because it's better to experience it for yourself. I guarantee you'll be scratching your head and asking "Who am I?" by the end.