Masterpieces of Mystery in Four VolumesMASTERPIECES OF MYSTERYReading editionChapter navigation14 reading sectionsGo to chapterChoose a chapter…Masterpieces of MysteryRIDDLE STORIESNOTEFOREWORDMASTERPIECES OF MYSTERYTHE MYSTERIOUS CARDTHE GREAT VALDEZ SAPPHIRETHE OBLONG BOXTHE BIRTH-MARKA TERRIBLY STRANGE BEDTHE TORTURE BY HOPETHE BOX WITH THE IRON CLAMPSMY FASCINATING FRIENDTHE LOST ROOMPrevious chapter ←FOREWORDNext chapter →THE MYSTERIOUS CARDAll chapters and sections (14)Masterpieces of MysteryRIDDLE STORIESNOTEFOREWORDMASTERPIECES OF MYSTERYTHE MYSTERIOUS CARDTHE GREAT VALDEZ SAPPHIRETHE OBLONG BOXTHE BIRTH-MARKA TERRIBLY STRANGE BEDTHE TORTURE BY HOPETHE BOX WITH THE IRON CLAMPSMY FASCINATING FRIENDTHE LOST ROOMRIDDLE STORIES← FOREWORDTHE MYSTERIOUS CARD →