H. Beam Piper's Time and Time Again is a classic mid-century science fiction time travel novel about memory, destiny, and the dangerous power of changing history. After suffering fatal injuries in a future war, Allan Hartley awakens in his own thirteen-year-old body with the full knowledge of his adult life intact. Trapped in the past just before a turning point in World War II, Allan realizes he may have a rare chance to reshape his family's fate, prevent future disaster, and alter the course of civilization itself.