About the book: 2023 / Photographer and adventurer Frederick Plowright could not resist the offer of Professor Clark Ashton Scarsdale to join the "Great Northern Expedition". Her task is to explore a mysterious cave system in the Black Mountains, which, according to the professor, holds the key to the future and the very survival of humanity. But in the caves, researchers also encounter ancient horror... The novel by the English writer B. Copper is rightfully considered one of the best works inspired by the grandiose “The Ridges of Madness” by H. P. Lovecraft. The book continues in the “Polaris” series a number of publications of works related to the genre of “lost worlds” - the old and ever-new genre of fantasy and adventure literature.