Book excerpt: Thoroughly researched and annotated, Professor Gedalyah Nigal's work examines such phenomena as the baalei shem - the individuals who by their knowledge of the "holy names" were able to perform great feats; kefitzat ha-derekh - the ability to traverse great distances in very little time; the transmigration of souls; dybbuks, possession, and exorcism; demons and their marriages to humans; the battles against forces of evil; the power of amulets; and journeys to the Garden of Eden and back.