The short novel incorporates the short story "The Sister City" by Brian Lumley, originally published in 1969.
Plot summary
Professor Ewart Masters convalesces at the home of his nephew, after an automobile accident. There he discovers the existence of an ancient Cimmerian city beneath the Yorkshire moors. He proceeds to have dream adventures in the realms of the Great Old Ones.
Reception
Gahan Wilson praised the novel as "by far the best thing [Lumley]'s done," with "a really dandy climax" and "a highly successful underground horrorland which is solid, consistent, and well designed."[1]
Chalker, Jack L.; Owings, Mark (1998). The Science-Fantasy Publishers: A Bibliographic History, 1923-1998. Westminster, MD and Baltimore: Mirage Press, Ltd. p. 50.
Joshi, S.T. (1999). Sixty Years of Arkham House: A History and Bibliography. Sauk City, WI: Arkham House. p. 131. ISBN0-87054-176-5.
Nielsen, Leon (2004). Arkham House Books: A Collector's Guide. Jefferson, NC and London: McFarland & Company, Inc. p. 118. ISBN0-7864-1785-4.