In the nineteenth and twentieth centuries, a popular belief system known as Spiritualism took the world by storm. People sought other realms of existence through mediums, seances, and other parapsychological means. While many of popular figures in the Spiritualist world were proven to be frauds, their practices have left their mark-in entertainment, in popular culture, and on true believers. This comprehensive book dives into the spirit world to separate fact from fiction and get to the bottom of ESP and other forms of parapsychology.