Striking, unexplicable stories circulate among the people of Nuevo Leon in northern Mexico. Stories of conversos (converted Jews) who fled the Inquisition in Spain and became fabulously wealthy in Mexico. Stories of women and children buried in walls and under houses. Stories of an entire, secret city hidden under modern-day Monterrey. All these stories are not corroborated in the official histories of the city. In this pioneering ethnography the author explores these folktales especially about the Sephardic Jews, said to be the “original” settlers, the “disappeared” indigenous population and the supposed “barbaric” society that persists in today’s Nuevo Leon. These explorations into a complicate history separates the facts from fiction.