Not often is there a book on Celtic-ness that not only includes ALL of the Celtic nations (especially the often left out Kernow & Mannin), but goes into depth for each chapter on a place from each. It is also quite thoroughly grounded in Celtic reality - no appropriated indigenous spiritualities to be found, just extrapolation from historical record, folklore, and the megalithic sites themselves. I really enjoyed this book, the gazeteer in the back is a brilliant addition with a wonderful range of sites to visit. My only qualm is it could be longer to take even more time on each site and chapter.