It is April 1922. Sir Arthur Conan Doyle arrives in New York on a spiritualist crusade. To packed houses at Carnegie Hall, he displays photographs of ghosts and spirits; of female mediums bound and gagged, ectoplasmic goo emerging from their bodies. In the newspapers, he defends the powers of the mysterious Margery, one of the most famous mediums of the day. His good friend Harry Houdini is a skeptic, and when Doyle claims Margery's powers are superior...