The Great Keinplatz Experiment and Other Tales of Twilight an the Unseen is a volume collecting 12 short stories written by Arthur Conan Doyle and published in 1925 by George H. Doran Co.
Sir Arthur Ignatius Conan Doyle KStJ DL (22 May 1859 – 7 July 1930) was a British writer and physician. He created the character Sherlock Holmes in 1887 for A Study in Scarlet, the first of four novels and fifty-six short stories about Holmes and Dr. Watson. The Sherlock Holmes stories are milestones in the field of crime fiction.