The owner of a fetish club finds out that, along with dealing with his wife who wants to leave him, his dying father, and the city wanting to close his club, he now has to deal with a psycho killer that's offing his employees and patrons.

Sister Kelly Wrath transforms from a nun with a simple temper problem to a vengeful killer. After being gunned down in an alley, she ascends to Heaven to receive training from some of the great figures of religious mythology—Moses, Gandhi, and Jesus Himself. She is sent back to Earth to join the other members of the Order of the Black Habit, a group of supernatural vigilante nuns as they seek revenge against the mob.