By Orson Scott Card
In a world not too far in the future, humanity is threatened by the alien species known to everybody as the Buggers. Society's only hope rests in the young boys and girls picked from their home countries by the International Fleet to serve mankind in the eventual war between the two sentient species. The story follows young Andrew "Ender" Wiggin in his training at Battle School, the space station turned training school in orbit around Earth. An excellent read for people of all ages, as while the main characters are young, the problems they must tackle and the doctrines they are subjected to are very mature indeed.