Teenager Susan Garth was “a clean-talking sweet little girl” of high school age before she started having “fits”—a sudden aversion to churches and a newfound fondness for vulgarity. Then one night, she strips in front of the parish priest and sinks her nails into his throat. If not madness, then the answer must be demonic possession. To vanquish the Devil, Bishop Crimmings recruits Father Gregory Sargent, a younger priest with a taste for modern ideas and brandy. As the two men fight not just the darkness tormenting Susan but also one another, a soul-chilling revelation lurks in the shadows—one that knows that the darkest evil goes by many names.