Published in 1924, Harry Houdini’s A Magician Among the Spirits serves as a definitive record of his crusade against fraudulent spiritualism following World War I. The book chronicles his investigation into mediums, his public fallout with Sir Arthur Conan Doyle, and his advocacy for critical inquiry into supernatural claims. The full text is available via Project Gutenberg . a magician among the spirits : Houdini, Harry, 1874-1926