The first definitive work on werewolfery, this book was written by a venerable author of occult studies. Unsurpassed in its sheer scope and depth, it employs a theological and philosophical approach, incorporating an extensive range of historical documentation and folklore. Summers examines the supernatural practice of shapeshifting, notes the finer distinctions between werewolfery and lycanthropy, and explores the differences of opinion on exactly how ordinary humans are transformed into creatures of "unbridled cruelty, bestial ferocity, and ravening hunger." His Gothic style, rich in fascinating examples and anecdotes, offers compelling fare for lovers of esoteric lore.