Title: Total absurd!
Review: The book's reasoning is based mostly on 2 presumptions: a poor priest has found something in Rennes-le-Chateau, and this something is a proof that Priory of Sion has some secret knowledge. Both of them are just eleborate hoaxes - everywhere in Internet you can find who, when and why concocted them (just look, for example for "Rennes-le-Chateau hoax". Priory of Sion was just a club of friends, some of them wrote the "ancient" parchments, and Mr. Plantard has never been a "St.Clair", and priest Sauniere received his wealth from illegal selling of masses, and died in poverty, after Church investigation. I recommend reading "The Unknown Treasure: the Priory of Sion Fraud and the Spiritual Treasure of Rennes-le-Chteau"
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