In 1634, in France, a handsome and lecherous sex-mad priest of the Parish of Loudun was tried, tortured and burnt at the stake. He had been found guilty of seducing an entire convent of nuns in a sensational case of possession and sexual hysteria. How did he do it? Why did he do it? What does it tell us about sex and faith in the medieval world? And – most importantly, why did Grandier maintain his innocence right to the moment of his gruesome death?