I read it. It's a rather simplistic and skewed version of the Holy Grail (sangreal or sangre real or royal blood) theory, basically saying that the Catholic Church supressed knowledge in order to supress women. (World ends! Women and minorities hardest hit!) There are actually much better books about the grail lore. There is some interesting scholarship that posits that Jesus (descendant of King David) married Mary Magdalene and had sons, and that the bloodline continues through the Merovingian Kings and Celt royalty to this day. It's wrapped up with Freemasonry, the Priory of Sion, the Gnostic Gospels, Dead Sea Scrolls, the Essenes at Qumran... Lots of really interesting stuff, but pretty heretical when you get right down to it. Of course, the "Davinci Code" doesn't get into all of it. Like I said, it's simplistic.