I have never fully grasped just what the Theory of Relativity is about, so areas of this book are virtually wasted on me. Undoubtedly it was a revolution in our sense of time, but it seems also to have left a new set of riddles. How did time itself begin? Why has it a definite direction, and can this be reversed? Is "time travel" mere fantasy, or is it factually possible? Much of Paul Davies's book is in question and answer form, but he is not "writing down" and some of his arguments, often supported by diagrams, need concentrated reading. All this is not helped by a small and rather ugly type face.