Ender's Game, written by Orson Scott Card, is a classic science fiction novel that explores the themes of war, leadership, and the ethics of conflict. Set in a future where humanity is at war with an alien species, the story follows Ender Wiggin, a young boy who is recruited into a military training program to prepare for the impending alien invasion. As Ender rises through the ranks, he must navigate the complexities of war and make difficult decisions that will determine the fate of humanity.