In Arthur Conan Doyle, it is sometimes difficult to determine where the detective story ends and the fantasy begins. The line between historical narrative and, so to speak, “alternative history” is very arbitrary. The writer's attention to each of the "lost worlds" is highly organic. Previously untranslated stories by A. Conan Doyle, dedicated to the strange and incredible, seem to have been created by the well-known hand of Dr. Watson, who suddenly decided to describe not just another adventure of the Great Detective, but a journey into a mysterious world. This collection reveals new facets of the talent of the Englishman and knight - Sir Conan Doyle.