Masterpieces of Mystery In Four Volumes RIDDLE STORIES Edited by Joseph Lewis French Garden City New York Doubleday, Page & Company 1922 COPYRIGHT, 1920, BY DOUBLEDAY, PAGE & COMPANY ALL RIGHTS RESERVED, INCLUDING THAT OF TRANSLATION INTO FOREIGN LANGUAGES, INCLUDING THE SCANDINAVIAN PRINTED IN THE UNITED STATES AT THE COUNTRY LIFE PRESS, GARDEN CITY, N. Y. NOTE The Editor desires especially to acknowledge assistance in granting the use of original material, and for helpful advice and suggestion, to Professor Brander Matthews of Columbia University, to Mrs. Anna Katherine Green Rohlfs, to Cleveland Moffett, to Arthur Reeve, creator of "Craig Kennedy," to Wilbur Daniel Steele, to Ralph Adams Cram, to Chester Bailey Fernald, to Brian Brown, to Mrs. Lillian M. Robins of the publisher's office, and to Charles E. Farrington of the Brooklyn Public Library. FOREWORD A distinguished American writer of fiction said to me lately: "Did you ever think of the vital American way we live? We are always going after mental gymnastics." Now the mystery story is mental gymnastics. By the time the reader has followed a chain of facts through he has exercised his mind,—given himself a mental breather. But the claims of the true mystery story do not end with the general reader. It is entitled to the consideration of the discriminating because it indubitably takes its own place as a gauge of mastery in the field of the short story. The demand was never quite so keen as it is now. The currents of literature as of all things change swiftly these times. This world of ours has become very sophisticated. It has suffered