C.S. Lewis (author of the Narnia series) authored this imaginary and wonderful take on heaven and hell--probably my favorite book ever on the subject. The tale begins in a sort of Limbo-ish town, where all is grey, everyone quarrels incessantly, and no roof can keep out the rain. But there is a bus station in this proto-hell, where the damned can take holidays and visit heaven, to thumb their noses at the blessed or--occasionally--to renounce their old ways and stay. The book follows several of these individuals, and the all-too-human paths they take that lead to a final choice to reign in hell rather than serve in heaven.
But what I most love about the book is its picture of heaven itself. Heaven is so real that the denizens of hell are mere ghosts there--see-through shadows who are unable to even bend a blade of grass with their own weight, to whom a raindrop is a bullet and a delicate flower as hard as steel. Lewis's description of the saints in heaven is as powerful as it is unpretentious--those that loved well and loved much are the great ones, while those who were famous on earth are virtually unknown. The story is an easy read, but one that will alter your picture of eternity forever.
About the Author
C.S. Lewis's books have been translated into dozens of languages and sold millions of copies. The author of the well-known Narnia series as well as seminal apologetic books like Mere Christianity and The Screwtape Letters, Lewis was the great explainer of faith to Western culture in the mid-20th century.