A fascinating journey into the so-called internal martial arts
Although not exactly a manual to learn internal martial arts, this book sure can pique a reader's interest! Much like a collection of anecdotes (which I love), thoughts, and insights, it is a great introduction to the martial arts of xingyiquan, taijiquan, and baguazhang, as seen through the author's eyes. The author talks of his many varied experiences and of many exceptional people that he met or learned from, making this book quite a fun read. Although practitioners won't find many specific techniques or training methods in this book, it is a good way to get people excited about the internal arts!
Note that there are two versions of this book; the newest one includes some additional material.