Part 1 of the 2-part 'The Mortification of the Flesh.' There is a room at the heart of the Vatican known as The Confessional, where any act may be committed without fear of guilt or sin. Here, the temptations of the flesh are drawn out and expunged through indulgence. But when something goes horribly wrong, a priest with a terrible secret is forced to turn to an outsider for help … an outsider named John Constantine.