The Bishop's Secret

From the publishers blurb: Bishop Pausanias, gray haired with merry blue eyes and respectable girth, has long been one of the city's pillars. He is famed for his charity and the holy protection he exercises over his city. So why do ghouls stalk the city at night? Why, on moonless nights, do zombies shuffle down streets, and what horror murders the faithful in their sleep? What is The Bishop's Secret?