Siddhartha, has been probably the most influential book I have ever had the privilege to read. I had to study the book in High school when I was younger. This book personally took me from a life of nonbeliever and atheism to embracing spirituality, Buddhism, and then Paganism.
For any one who is interested in eastern pathways this book is a absolute must! Rather than post a brief biography I managed to find a complete copy of the book free online (at least I believe it is complete thus far, I can't find my own copy to confirm). Although I would suggest that you buy a copy and read it outside...
You can find the book here:
http://www.online-literature.com/hesse/siddhartha/Please give it a chance and tell me what you think.
Many Blessings,
Nicholas