Replete with terror, passion, and hope, this gripping narrative history explores the intricate mysteries of medieval Europe through the lives of the great heretics whose beliefs and practices challenged the teachings of an all-powerful church. Five centuries of social and spiritual turmoil are covered through a vivid and telling mix of events, personalities, and ideas.

Michael Frassetto teaches history at the University of Delaware and has written extensively on the history of medieval heresy, religion, and society. He was the religion editor for "Encyclopaedia Britannica" for a number of years. He lives in Medford, New Jersey.