The Middle Ages,” wrote Carl Jung in a 1958 book about UFOs, “have not died out. . . . Mythology and magic flourish as ever in our midst.” I doubt if Monica Black, a professor of history at the University of Tennessee and the author of A Demon-Haunted Land,an intriguing, subtle, and occasionally startling examination of a wave of superstitious belief that swept across Germany in the immediate post-war years, would disagree. Certainly, Black recognizes the fascination that supernatural ideas and practices, from astrology to the occult, held for millions of Germans “across the modern period” as well as the persistence of a long-standing tradition of folk and magical healing.