The more I read Dan Brown's books the more I think he got really lucky with The Da Vinci Code. This book is pretty much the same kind of adventure, but it isn't as clever or as interesting.
While some of the lore about the Mason's and their rituals kept it going it wasn't enough to help pull the book along. If you want a good Dan Brown book read the The Da Vinci Code again. That book built up to something interesting in the end. This one just fizzled out with lame predictions of how the world would change for the better.
I think I am done with Dan's books at this point. It is the same old stuff rehashed again.