Ender's Game (Ender Quintet Series #1)

Once again, the Earth is under attack. Alien "buggers" are poised for a final assault. The survival of the human species depends on a military genius who can defeat the buggers. But who? Ender Wiggin. Brilliant. Ruthless. Cunning. A tactical and strategic master. And a child. Recruited for military training by the world government, Ender's childhood ends the moment he enters his new home: Battleschool. Among the elite recruits Ender proves himself to be a genius among geniuses. In simulated war games he excels. But is the pressure and loneliness taking its toll on Ender? Simulations are one thing. How will Ender perform in real combat conditions? After all, Battleschool is just a game. Right?