Ender's Shadow

The human race is at War with the "Buggers", an insect-like alien race. The first battles went badly, and now as Earth prepares to defend itself against the imminent threat of total destruction at the hands of an inscrutable alien enemy, all focus is on the development and training of military geniuses who can fight such a war, and win.

The long distances of interstellar space have given hope to the defenders of Earth--they have time to train these future commanders up from childhood, forging then into an irresistible force in the high orbital facility called the Battle School.