Unreliable narrators have populated literary works for hundreds of years. Piero Rosini, the narrator of Francesco Pacifico’s novel The Story of My Purity (Farrar, Straus and Giroux; 292 pages; translated from the Italian by Stephen Twilley) is not unreliable in a naïve or precocious way like Huck Finn, but utterly loathsome in the vein of Nabakov’s Humbert Humbert. Rosini is a devout Catholic working as an editor in a right-wing publishing house in Rome. His current project is a book that would expose Pope John Paul II as having been born Jewish and planted in the Catholic Church by Frankists. […]