In 1885 Berenger Sauniere was appointed priest of Rennes-le-Chateau, a tiny village in the south of France. It is said that he found a fabulous treasure, or was guardian of an amazing secret about Jesus Christ. Many authors have written about the mystery, each adding their own interpretation to an ever-deepening whirlpool of fantasy. The Priory of Sion, a mysterious organisation apparently founded in the 12th century, and boasting among its Grand Masters Leonardo da Vinci, Jean Cocteau and Claude Debussy, is said to lie behind the extraordinary tale. In his recent exciting novel, "The Da Vinci Code", Dan Brown makes much use of the Priory of Sion. But does the Priory of Sion really exist? Bill Putnam and John Edwin Wood have now published a serious study of Rennes-le-Chateau. They come to firm conclusions about mystery and reveal the real source of Sauniere's wealth and the true nature of the Priory of Sion.