Going out in the morning for a quick beer and running into enemy tanks by the entrance—what a cheerful prospect. Who could have known that a promising encounter with your own double from the near future would turn out so tragically? The double arrives with an invaluable gift—four books you haven’t written yet—and offers to carry out one intensely personal experiment. And the result is a terrible cataclysm that shatters time and turns Earth into a world where superpowers, having crashed headlong into each other, spill their brains across the continents. But the merciless wheel of history can still be turned back—if the experiment is repeated... and again... and again...