Just read the book. It was quite good. I enjoyed the first half a lot more than the second half. I found i nthe beginning the information was much more interesting. I didn't find the story line that compelling, just the theology. The ending was too abrupt, I wanted more information regarding the family and the Grail. Mostly the family and how it all fits into the Priory of Sion. I would recommend it, but I think it mostly just opened my eyes to further reading I can do into secret societies, religion, and their histories; two topics i find interesting.