While earnest and well-meaning, this book falls very short of cracking 'Christianity's Greatest Secret'. The research is poorly documented and the book oddly organized. After an interesting if somewhat wishful analysis of several key art works and their artisits, the authors spend the bulk of the book offering a fairly easy-to-read and nothing-new summary of Rennes-le-chateau, Gnosticism, the Magdelene tradition in the south of France, the Cathars, and so on. If you knew nothing about any of these things, this is not a bad overview. But if you're waiting for the big secret and the big discovery, it all happens in a couple of brief chapters at the very end. Their conclusions are very thin and undocumented, and quite a lot of the book just doesn't make sense. For example, they try to present the infamous "A Dagobert II Roi..." encoded message in the Rennes parchments as "A Dagoberti I Roi...", insisting that in archaic French in its latinized form Dagobert is Dagoberti. So all the experts that have come before never considered this or were unfamiliar with archaic French? In describing Poussin's The Deluge, the authors insist that a figure in the forground is swimming with a book (which they think represents esoteric knowledge). Granted I have not seen the originals, but in all the versions of this painting I've seen, this is not a guy swimming with a book-- it's a guy floating on a plank of wood. It just doesn't look like anything other than a plank of wood. As a final example, the authors find a pentagram-- and only one-- in Poussin's Shepards painting by extending lines from two staffs held by figures in the painting. Of course , other figures are holding staffs, trees are making lines, and there seem to be a wealth of pentagrams hidden in this painting. The authors choose the one they want and ignore the rest. And the one they choose isn't even a complete pentagram-- it runs off the page, which they say is a special 'active pentagram' with esoteric significance. Maybe so, but I don't buy it. Or much else in this rather sad entry.