With the appearance of the demonic Christmas character Krampus in contemporary Hollywood movies, television shows, advertisements, and greeting cards, medieval folklore has now been revisited in American culture. Krampus-related events and parades occur both in North America and Europe, and they are an ever-growing phenomenon.

Though the Krampus figure has once again become iconic, not much can be found about its history and meaning, thus calling for a book like Al Ridenour's The Krampus: Roots and Rebirth of the Folkloric Devil. With Krampus's wild, graphic history, Feral...