Of course Jensen heavily leaned on the book of the Holy Blood and the Holy Grail, but the way she weaved that with the vampire/bloodline story, the old Annunaki-stories about this stuff you drink to get immortal, the old Unicorn-legend and the historical facts and speculations, made here an infinite better story-teller than Dan Brown. She obviously knowns her classics, and has read a lot, and is historically very accurate. Same as in Sins of the Fathers (where I got most of my Voodoo-knowledge), and The Beast Within (that still makes me want to visit Bayern,Germany some day).
So I keep hoping she will write more (Gabriel Knight) games, or maybe turn to writing books . She MUST have more stories to tell.