In a controversial field this appears to be a well balanced review of the many theories advanced. Understandably the emphasis is on the (Celtic) British origins. References to the various interpretations of ley lines focus mainly on British ideas, emphasis being on trade routes and burial practices, with pro's & con's of the more outrageous. Limited attention is given to South American ideas, virtually none to USA & Eastern. It is well written and eminently readable. Many instances of Ley line patterns are given in an appendix.