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. 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.