A hidden world of subterranean torment and ancient alien legacies is revealed through the channeled writings of Richard S. Shaver. The magazine presents Shaver's claims of discovering evidence for a malevolent race, the Deros, who inhabit Earth's caverns and prey upon humanity, particularly women. These narratives, promoted by Ray Palmer, served as the foundation for the Shaver Mystery Club, fostering debate on the occult, UFOs, and Lemurian lore, and were presented as 'fact-fiction' exploring hidden truths.

This publication is presented as a scarce and historically significant artifact from the early days of UFO and occult discourse. The Shaver Mystery Magazine is noted for its role in popularizing early theories about UFOs and its deep engagement with fringe beliefs, including the occult and Lemurian lore. The stories themselves, presented as 'fact-fiction,' delve into a unique mythology of subterranean races and alien legacies, reflecting a specific moment in pulp magazine history. The magazine's format and content are indicative of a dedicated readership interested in esoteric subjects and speculative narratives.