In his Space Trilogy, C.S. Lewis speaks on the nature of demons and angels, revealing their interactions and influence on mankind, as well as their role in God’s plan.
Geib, John David
"C.S. Lewis's Ontological View of the Demonic: Satan as an Explanatory Postulate,"
Inklings Forever: Published Colloquium Proceedings 1997-2016: Vol. 2
, Article 24.
Available at: https://pillars.taylor.edu/inklings_forever/vol2/iss1/24