Ender's Game Book 2. Speaker of the Dead

Ender's Game" tells the story of Ender Wiggin, a young prodigy recruited by the International Military to lead the fight against the Formics, an insectoid alien race that previously attacked Earth. Ender, along with other gifted children, is sent to Battle School for training, where he excels in simulated war games. The novel explores themes of leadership, responsibility, and the psychological toll of war, culminating in a final, decisive battle that determines the fate of humanity.