I really liked 5 people you meet in Heaven, although I liked C.S. Lewis The Great Divorce. I know the second is not about Heaven, but it tells a story about the more "real" we are the closer we are to being in Heaven. I guess it is like gravity, the heavier we are, the more substantial we are the more real we are.
5 people is great because it shows how people can help others in their life story and their journey in ways we don't understand while on earth. It also helps people appreciate the people in their lives.