Southern France in the 14th century: The Church is fighting bitterly against the Cathars and the mills of the Inquisition grind without pause. In the town of Lazet, Brother Bernard is the Inquisitor, but instead of fanaticism, his actions are determined by understanding. He abhors torture, preferring to use tactics and finesse in his interrogations. But then his superior is cruelly murdered, and Bernard himself becomes the target of the Inquisition...