This book presents the most recent scholarship on the sixteenth-century convert Johannes Pfefferkorn and his context. Pfefferkorn is the most (in)famous of the converts from Judaism who wrote descriptions of Jewish ceremonial life and shaped both Christian ideas about Judaism and the course of anti-Jewish polemics in the early modern period. Rather than just rehearsing the better-known aspects of Pfefferkorn’s life and the controversy with Johannes Reuchlin, this volume re-evaluates the motives behind his activities and writings as well as his role and success in the context of Dominican anti-Jewish polemics and Imperial German politics. Furthermore, it discusses other converts, who similarly "revealed the secrets of the Jews", and contains detailed studies of the campaigns against the Talmud and other Jewish books as well as the diffusion of Pfefferkorn's books and other anti-Jewish writings throughout early modern Europe. Revealing the Secrets of the Jews thus presents new perspectives on Jewish-Christian relations, the study of religion and Christian Hebraism, and the history of anthropology and ethnography.