Narnia, Perelandra--places of wonder and longing. The White Witch, Screwtape--personifications of evil. Aslan--a portrait of the divine. Like Turkish Delight, some of C.S. Lewis's writing surprises and whets our appetite for more. But some of his works bite and nip at our heels. What enabled C.S. Lewis to create such vivid characters and compelling plots? Perhaps it was simply that C.S. Lewis had an unsurpassed imagination. Or perhaps he had a knack for finding the right metaphor or analogy that awakened readers' imaginations in new ways. But whatever his gifts, no one can deny that C.S....