Sir Arthur Ignatius Conan Doyle was a Scottish physician and writer, most noted for his stories about the detective Sherlock Holmes, generally considered a milestone in the field of crime fiction, and for the adventures of Professor Challenger. He was a prolific writer whose other works include science fiction stories, plays, romances, poetry, non-fiction and historical novels.

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Conan Doyle was friends for a time with Harry Houdini, the American magician who himself became a prominent opponent of the Spiritualist movement in the 1920s following the death of his beloved mother. Although Houdini insisted that Spiritualist mediums employed trickery (and consistently exposed them as frauds), Conan Doyle became convinced that Houdini himself possessed supernatural powers—a view expressed in Conan Doyle's The Edge of the Unknown. Houdini was apparently unable to convince Conan Doyle that his feats were simply illusions, leading to a bitter public falling out between the two.