If you're looking for fiction books, I would SO recommend Frank Peretti's books "This Present Darkness" and Piercing the Darkness". Although the books tell a story about people, it also shows how the forces of darkness and the heavenly hosts are in constant battle, right over our heads. We just can't see them. Trust me. Awesome!
If you know the bible a little, The Chronicles of Narnia movies are an excellent parallel to the way God is in our lives. But it's not transparent. It's a deep meaning.
And if you're looking for a collection of books, check into the "Left Behind" Series. Also fiction, the follow the lives of these people who were left behind after God's resurrection of the saints, and how they try to survice through the years of tribulation.
Good luck!!