In the mid-eighteenth century, as new ideas—and a new unrest—begin to sweep the Continent, a young Jew of mysterious origins arrives in a village in Poland. Before long, he has changed not only his name but his persona; visited by what seem to be ecstatic experiences, Jacob Frank casts a charismatic spell that attracts an increasingly fervent following. In the decade to come, Frank will traverse the Hapsburg and Ottoman empires with throngs of disciples in his thrall as he reinvents himself again and again, converts to Islam and then Catholicism, is pilloried as a heretic and revered as the Messiah, and wreaks havoc on the conventional order, Jewish and Christian alike, with scandalous rumors of his sect’s secret rituals and the spread of his increasingly iconoclastic beliefs.