Big God, Little Devil offers different perspective on the devil/demonic possession for baptized Christians. It’s not a topic you hear most people discuss, especially in Protestant circles. Needless to say, the author is Catholic. It made a lot of sense to me and was comforting.
One of the best books on Spiritual Warfare I've yet read. Far more (appropriately) focused on the light, love, power, and goodness of God than on the enemy. Highly recommended, especially for Catholic Christians. Empowering.