I am a freemason and have met the author (also a freemason) in person on a few occasions. He is an excellent lecturer with profound insight and a pleasure to be with--qualities reflecting on this book as well.
Apart from being beautifully illustrated, the text puts forth very clearly and succintly what the essence of Freemasonry is, or at least should be: the knowledge of one's self. This book is very highly regarded in English, Continental and American esoteric masonic circles.
Recommended both for masons and non-masons alike. If you read only one book on Freemasonry, this should be it. I'd give it 6 stars if it was possible.