If you are looking for a truly Spiritual book, I'd recommend, "The Principles of Effortless Power" by Peter Ralston. In it he describes his search for enlightenment through meditation and Martial Arts.
He founded a school called "CHENG HSIN". The book I have was released on "North Atlantic Books", Berkley, California in 1999. It's the kind of book that'll take a lifetime to absorb. He leads you through his personal experiences which led towards enlightenment.
I hope you find the book you're looking for, but check this one out too.