The revered author's definitive collection of short fiction, which explores enduring spiritual and science fiction themes such as space, time, reality, fantasy, God, and the fate of humankind. From C.S. Lewis-the great British writer, scholar, lay theologian, broadcaster, Christian apologist, and author of Mere Christianity, The Screwtape Letters, The Great Divorce, The Chronicles of Narnia, and many other beloved classics-comes a collection of his dazzling short fiction. This collection of futuristic fiction includes a breathtaking science fiction story written early in his career in which Cambridge intellectuals witness the breach of space-time through a chronoscope-a telescope that looks not just into another world, but into another time. As powerful, inventive, and profound as his theological and philosophical works, The Dark Tower reveals another side of Lewis's creative mind and his longtime fascination with reality and spirituality. It is ideal reading for fans of J. R. R. Tolkien, Lewis's longtime friend and colleague.