Catherine Crook de Camp was an American author and editor in the realms of science fiction and fantasy. Much of her literary output was a collaboration with her husband, L. Sprague de Camp, with whom she shared sixty years. Her solo endeavors leaned towards non-fiction. Her writing explored themes reflecting her background in economics and literature, characterized by precision and insight.
Citadels of Mystery is also known as Ancient Ruins and Archaeology. The past yields its secrets reluctantly; blues to the ways ancient knowledge are found in the ruins of twelve civilizations, including an exploration of theories of space invaders, created earth or man, and Atlantis.