I found this book very interesting and loaded with information - but I couldn't take it all in one sitting, and I had to suspend my disbelief to take it all in.
If you have an interest in ancient pre-Celt and early Celt history, energy fields of the Earth, and some eye-opening theories by someone who has personally researched a field deeply (and literally, in the fields)- then this is for you.
If you are into debunking, this will also give you grist for the mill, however.
I only recommend this book for those with an openness to alternate views of physics/metaphysics.
After 50 years of wondering about stone circles and earth energies, I have finally found answers in this book.
Liked it enough to buy 7 copies for distribution to friends who also loved it and talked about it for years.