The retreat center where we are staying for these few days also has a pretty good Christian library. Last night I came across a book I had read quite a few years ago, but really enjoyed. The Great Divorce, by C.S. Lewis, is a book that I would recommend to anyone. It is entertaining, but primarily thought-provoking.
I would explain more about the book, but I have found summarizing this particular work very difficult. It would be much better if you just read it for yourself!
I will just say that the ‘Great Divorce’ about which Lewis writes has nothing to do with matrimony. He is writing about Heaven and Hell.