In a day were the "The Da Vinci Code" is the bed time book of scores of families -- and other books are riding the popularity of it -- "Foucaults' Pendulum" remains the undisputed and unmatched book on "conspiration theories" and alternative christian interpretation. It's interesting that a work plainly marked as fiction and that doesn't pose for anything else is more well researched and backed than books that try to sell an "authoritary" look. This book, while not without some small shortcomings, is adictive and extremely compelling. The Templars, the Priory, Christ, R+C, the Cathars, the FM, the Grail, all this and much, much more is connected in a game-like manner by the main characters in the book. The dialogues are witty and the characters well-developed. It's harder to read than other books of the genre, but in a way "Foucault's Pendulum" is in it's own genre... the sheer ammount of information presented, the use of several languages, the use of unheard of symbols and facts, all combines to make the book a bit dense but very rewarding. Eco, at the same time he exposes the leaps of faith and logic that some theories make in the way of reaching a suitable conclusion, shows the joy and motivation in the process of contructing alternative theories and even fleshes out some extremely interesting historic connections.