Haven't had exact idea of what I am about to read, but since Graham's books are familiar to me it felt promising. Now, after reading it all my feelings about it are little ambiguous.
I have to give both Graham and Robert that the book contains tremendous amount of historical data so as a sort of starting point for further research the book is just perfect. Regarding the rest it feels somehow superficial. The book basicly describe main historical players (Cathars, Bogomils, Hermetics, Machicheans etc.), the major characters and draws lines in between them. Sometimes drawing the lines is so exhausting one feels like putting the book away and screaming. Again, hats off to boh autors for working with such huge amount of data. But what I am missing here is some conclusion. It feels like more like travel guide showing you how to get here and there but missing some backstory, some deeper understanding of especially latest events described in the book. Particularly: what other connection is there between the "old cults" (i.e.Cathars, Bogomils, Manicheans) and "new cults" (Freemasons)? It feels like old cults valued wisdom and living in truth as the highest points of live while Masons extolled egyptian sciences(astrology, mathematics, geometry). Now what else is there?
Based on what's written it feels like that somewhere in 18th century something went wrong and Good things started to change into Evil ones - here I am pointing mainly to the end of the book speculating on Freemasons becoming archenemy of Islam.
In general I enjoyed the book very much despite it's sometimes tedious, pushing the dense bulk of data on reader. For me this is sort of one of first steps to understand this more yet I was hoping that after absorbing the book's content I would understand what was it about. Instead I feel like there's much more unanswered questions than at the beginning.
As for conspiracy potential of the book, there might be bit too much forays into the land of imagination and conspiracies but on the other hand authors had to work what's at hand and I can imagine there are not many books describing shady world events in great detail so one should take the book as a sort of investigation with some room for doubts.