Stories about werewolves, defined in this book as “a creature that changes form, or appears to do so, or can be inferred to do so, in whole or in part, between the humanoid and the lupine” (p. 7) are vanishingly rare in ancient Greek and Latin texts. Other than a vivid vignette told by Petronius in chapter 68 of the Satyricon (c. 66 CE), in which a soldier transforms into a wolf in a graveyard, terrorizes a local farm until it is wounded with a spear, and is later revealed to be a “skin-changer” (versipellis) by the persistence of that wound when he returns to human form, most ancient references to people changing into wolves and back again are pithy and laconic. Undeterred by this limitation, Daniel Ogden sets out in this book to examine ancient references to these skin-changers through the lens of folklore and to provide lengthy translations of primary sources that allude to “werewolfism.” The resulting book – part comparative history and part sourcebook – shares the hybrid character of its subject matter. The results are mixed as well. Readers lured by the title may be disappointed to find that not only are werewolves very scarce in this book, for the reasons cited above, but also in many places medieval, early modern, and modern comparanda overshadow the meagre ancient evidence.