For a 20th-century man, Conrad Stargard had done a lot in 13th-century Poland. In just nine years he had "discovered" universal education, aircraft, radios, steamboats, and machine guns. More important, he had prepared Poland to defeat the bloodthirsty Mongols in 1241.
But, now that the Mongol hordes had arrived, something was disturbing the flow of history. Even the Time Masters who secretly watched over Conrad couldn't predict his future, because they no longer knew their own past...