"Ender’s Game" by Orson Scott Card
In the distant future, an alien invasion seems to be imminent against the human race. In order to fight it off, the government has put into place a program in which children are bred to become genius soldiers. A young boy who goes by the name of Andrew “Ender” Wiggin who lives with disconnected parents, a sadistic brother and a kind sister finds himself drafted into that program. While Wiggin’s skills and performance prove to everyone that he is an incredibly capable soldier, yet growing up in such a community has a psychological impact on anyone.