Ender's Game

Orson Scott Card's novel earns its reputation. The tactical sequences in Battle School are genuinely exciting, the pacing is nearly flawless, and the final revelation reframes everything that came before it with a moral weight that stays with readers for years. It won both the Hugo and Nebula and is recommended reading by the U.S. Marine Corps, which tells you something about how seriously it takes questions of strategy and leadership. The honest caveat: the story involves the psychological manipulation of children, one disturbing scene of child violence, and the moral weight of genocide as a plot point. These are treated with seriousness rather than gratuitously, but parents of younger readers should preview it. Card's personal public views are separate from this text, which stands on its own as one of science fiction's essential novels.