As a Scotsman who has been brought up in a family with Masonic connections, I wished to read this book as a means to develop more of an understanding of the Craft. I was not disapponted - as my review title suggests, the introduction had me hooked - the author's travels to the rugged Argyll area and his discoveries there had me slavering for more (and had me visiting the very area only a few days later). This was the personal hook that reeled me in for the remainder of this fascinating story.
As with "Holy Blood, Holy Grail", it appears that certain "convenient" connections are made, making the reader more than a little bit sceptical at the truth of the story. However, I would be willing to wager that a substantial proportion of the research is close to the mark.
From the Temple of Solomon through to WW2, you can make your own mind up as to how influential the hermetic societies are upon reading this book.
For anyone interested in the roots of the Masonic Craft, I would recommend this highly, as I am quite sure the Grand Lodge of Scotland has done also.