The Land of Mist is a novel written by Arthur Conan Doyle in 1926. Although this is a Professor Challenger story, it centres more on his daughter Enid and her colleague. Heavily influenced by Doyle's growing belief in Spiritualism after the death of his son, brother, and two nephews in World War I, the book focuses on Edward Malone's at first professional, and later personal interest in Spiritualism. There is a suggestion in chapter two that the deaths of `ten million young men' in World War I was by punishment by the Central Intelligence for humanity's laughing at the alleged evidence for life after death.

George Edward Challenger, better known as Professor Challenger, is a fictional character in a series of science fiction stories by Sir Arthur Conan Doyle. Unlike Conan Doyle's laid-back, analytic character, Sherlock Holmes, Professor Challenger is an aggressive, dominating figure.

Sir Arthur Ignatius Conan Doyle, DL (1859-1930) was a Scottish author. He is most noted for his stories about the detective Sherlock Holmes, which are generally considered a major innovation 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, historical novels, plays and romances, poetry, and non-fiction. His first significant work was A Study in Scarlet, which appeared in Beeton's Christmas Annual for 1887 and featured the first appearance of Sherlock Holmes, who was partially modelled after his former university professor, Joseph Bell. Other works include The Firm of Girdlestone (1890), The Captain of the Polestar (1890), The Doings of Raffles Haw (1892), Beyond the City (1892), The Adventures of Sherlock Holmes (1892), The Exploits of Brigadier Gerard (1896), The Great Boer War (1900), The Green Flag (1900), The Hound of the Baskervilles (1902), and The Lost World