Orson Scott Card
In The Future
Aliens attack earth twice and are preparing for another, or so that's what the humans on earth think? So to be prepared they start breeding little kid geniuses as a weapon against the aliens. And Ender Wiggins is one of them...
But shortly after he goes into command training they run out of time, and they choose Ender to lead the fleet into war against these aliens... will Ender succeed or will he lead the entire human race into extinction??????