I would highly recommend this nice and unusual book to read! It can be downloaded for free at http://schambala.org/books.html
Actually it's a series of books united by one main character Sensei who is a martial arts teacher as well as philosopher, chiropractor and a very wise man. He is an educated person, teaches very humane life philosophy and reveals secrets of some martial arts to his disciples.
After I have read this book, I started to practice martial arts and got interested in spiritual issues, history and religion.