Sophie’s World is one of the most unique, mysterious, and thought-provoking book, it opens the reader’s mind to the world of philosophy and its most fundamental questions, such as the argument about one’s existence.

The story revolves around a fourteen year old Norwegian girl, Sophie Amundsen; the main protagonist of the novel, who lived with her mother. One day, while coming back home from school she finds a letter in the mailbox. It was for Sophie, but it didn't say who it was from. There was no stamp on it either. It contains a question for her “Who are you?”. Nothing else, only three words and followed by a large question mark. The other day, she got a letter containing the question “Where did the world come from?”

These questions leave Sophie in deep wonder, opening her inquiring mind to view ordinary nature in a new light. From here Sophie's journey as a philosophy student starts. Later she discovers that she received the letters from a philosophy teacher named Alberto Knox. He introduces her to different Philosophers alongside their theories from the Pre-Socratics to Jean-Paul Sartre (Present).

I highly recommend this book, must give it a read.