The Unseen Realm (Unabridged) - Dr. Michael S. Heiser
I bought this on Audible. It's a great book that transcends the lightweight teaching you get other places (like as in church). However, it's a scholarly book that requires concentrated listening and persistence. It explores what was in the minds of the Old and New Testament writers and characters when they referenced spiritual and cosmic realities. If you want to understand the tie between ancient near-east "myth," C.S. Lewis, Tolkien, the Old Testament "weird stuff," and Jesus, Paul, Peter, and Jude in the NT, this is it!