The book concerns the investigation into the death of Jonas Fairlie, who was murdered on a train while on his way to consult Solar Pons. To solve the mystery, Pons and his companion, Dr. Lyndon Parker, travel to Fairlie's home town of Frome, Somerset and from there to Scotland, Cheltenham in Gloucestershire, and finally to a remote area on the coast of Wales.
Chalker, Jack L.; Mark Owings (1998). The Science-Fantasy Publishers: A Bibliographic History, 1923-1998. Westminster, MD and Baltimore: Mirage Press, Ltd. p. 845.
Joshi, S.T. (1999). Sixty Years of Arkham House: A History and Bibliography. Sauk City, WI: Arkham House. p. 183. ISBN0-87054-176-5.
Nielsen, Leon (2004). Arkham House Books: A Collector's Guide. Jefferson, NC and London: McFarland & Company, Inc. p. 153. ISBN0-7864-1785-4.