This program is part of the popular series from the History Channel that investigates some of civilization's unsolved mysteries and controversies. This episode investigates the black chapter in world religious history known as the Inquisition. In search of truth, it told lies; preaching redemption, it brought torture and death. Recently opened archives of the Catholic Church are used to present new evidence about the church hierarchy's abuse of power. The documentary introduces the viewer to some of the Inquisition's most notorious characters, including Grand InquisitorTomas Torquemad, who was responsible for the death of thousands of people branded as heretics and witches. Galileo and the Knights Templar were among their number. Art work, journals, reenactments, and scholarly commentary tell the true story of the Inquisition.