A collection of essays on various topic -- of various interest, too.
I liked the one on ritual nudity best. He tracks down what can be learned and established three widespread practices: among people taking on the roles of supernatural and liminal beings, and among those being initiated, are the real ones, and a folkloric one is so widespread -- Africa, Europe, Asia, the Americas -- that he mentions that witches, people who work evil magic, do so naked, so representing their evil, antisocial nature.
Others debunking some beliefs, and still others discussing elements of ancient religious practice. The one on the Inklings is weak.