The author tracks the course of the book from its origins in 1239 to its most salient episodes in the seventeenth and eighteenth centuries, introducing colorful individuals obsessed with possessing the legendary work--and the equally obsessive passion of those who wanted to punish people who sought it. This account sheds light on the power of atheism, the threat of blasphemy, and the persistence of free thought during a time when the outspoken risked being burned at the stake.