If you strip out the murdering and the guns, this books looks like a documentary. The books is about Robert Langdon — a professor of Religious Symbology — “Opus Dei” — which responds on the fact the they are put down very old fashioned — and “The Priory of Sion” of which Da Vinci and Newton were members. The content is highly questionable and very sugestive and that makes it an extremely good book in my opinion. But probably also the rest of the world. If you only search amazon for “The Da Vinci Code” you will find a lot of books on this exactly same subject.
And Kees, I haven’t revealed the plot so you can continue after page 210!