The Screwtape Letters, written from the point of view of a demon whose object is to send souls to Hell, is a deeply Christian work but its appeal comes just as much from C.S. Lewis' insight into what makes humanity tick.
Did you know that before Gillian Flynn brought us the book Gone Girl, the movie Gone Girl, and the concept of "Gone Girl-ing" someone, she wrote a murder mystery about a different kind of unhealthy family dynamic!