An expert at simulated war games, Andrew "Ender" Wiggin believes that he is engaged in one more computer war game when, in truth, he is commanding the last Earth fleet against an alien race seeking Earth's complete destruction.

Set during Enders first years at Battle School, where it is forbidden to celebrate religious holidays. However, after a small act of rebellion sets off a battle royal between the students and staff, some surprising alliances form when Ender comes up against a new student.

Parallel story to Ender's game. An orphan named Bean is found on the streets of Amsterdam and taken to Battle School, where he becomes both friend and rival to Ender Wiggin.