The 1920s are famous as the golden age of jazz and glamour, but it was also an era of fevered yearning for communion with the spirit world, after the loss of tens of millions in the First World War and the Spanish-flu epidemic. A desperate search for reunion with dead loved ones precipitated a tidal wave of self-proclaimed psychics—and, as reputable media sought stories on occult phenomena, mediums became celebrities.

Against this backdrop, in 1924, the pretty wife of a distinguished Boston surgeon came to embody the raging national debate over Spiritualism, a movement devoted to communication with the dead. Reporters dubbed her the blonde Witch of Lime Street, but she was known to her followers simply as Margery. Her most vocal advocate was none other than Sherlock Holmes’ creator Sir Arthur Conan Doyle, who believed so thoroughly in Margery’s powers that he urged her to enter a controversial contest, sponsored by Scientific American and offering a large cash prize to the first medium declared authentic by its impressive five-man investigative committee.  Admired for both her exceptional charm and her dazzling effects, Margery was the best hope for the psychic practice to be empirically verified.  Her supernatural gifts beguiled four of the judges. There was only one left to convince…the acclaimed escape artist, Harry Houdini.