by Orson Scott Card
After the first and second invasion of an alien species, a training group is formed, consisting of select children. They are being pushed to their limit, so that they will be able to handle a third invasion. One child stands out, Ender Wiggins. Through battle simulations, some will be eliminated and others will be promoted. Ender proves to be an outstanding opponent. At the end, with his final test, he realizes that it wasn’t just a game.