Do you know what zodiac sign you were born under? Do you read the page with your own horoscope while flipping through a magazine, even if just for fun? Do you notice when the thirteenth of the month falls on a Friday? Have you heard or read the names Merlin and Nicolas Flamel, at least in connection with the Arthurian legend or Harry Potter? Can you recognize a tarot card? Do you have even a vague idea of what Kabbalah is? Do you know what a grimoire is? Do the names Agrippa von Nettesheim, Eliphas Lévi, Papus, and Aleister Crowley mean anything to you? Can you make sense of the term spiritism? Do you know what a Ouija board is, or have you ever experimented with one? I would be surprised if you picked up this book without at least five questions that you could answer with a clear yes.