THE GREAT KEINPLATZ EXPERIMENT And Other Tales of Twilight and the Unseen by A. CONAN DOYLE New [Illustration] York George H. Doran Company Copyright, 1905, 1908, 1909, 1910, 1911, 1913, 1914, 1918, 1919, by A. Conan Doyle Copyright, 1910, by Charles Scribner’s Sons Copyright, 1911, by Associated Sunday Magazines, Inc. Copyright, 1908, by the McClure Company Copyright, 1900, 1902, by the S. S. McClure Company Copyright, 1894, D. Appleton & Company [Illustration] THE GREAT KEINPLATZ EXPERIMENT AND OTHER TALES OF THE UNSEEN ----Q---- Printed in the United States of America CONTENTS PAGE I THE BROWN HAND 9 II THE USHER OF LEA HOUSE SCHOOL 30 III B. 24 51 IV THE GREAT KEINPLATZ EXPERIMENT 72 V CYPRIAN OVERBECK WELLS 95 VI PLAYING WITH FIRE 120 VII THE RING OF THOTH 139 VIII THE LOS AMIGOS FIASCO 163 IX HOW IT HAPPENED 174 X LOT NO. 249 179 XI “DE PROFUNDIS” 225 XII THE LIFT 239 THE GREAT KEINPLATZ EXPERIMENT _and Other Tales of Twilight and the Unseen_ I THE BROWN HAND Every one knows that Sir Dominick Holden, the famous Indian surgeon, made me his heir, and that his death changed me in an hour from a hard-working and impecunious medical man to a well-to-do landed proprietor. Many know also that there were at least five people between the inheritance and me, and that Sir Dominick’s selection appeared to be altogether arbitrary and whimsical. I can assure them, however, that they are quite mistaken, and that, although I only knew Sir Dominick in the closing years of his life, there were none the less very real reasons why he should show his goodwill towards me. As a matter of fact, though I say it myself, no man ever did more for another than I did for my Indian uncle. I cannot expect the story to be believed, but it is so singular that I should feel that it was a breach of duty if I did not put it upon record--so here it is, and your belief or incredulity is your own affair.