When you first step onto Platform Nine and Three-Quarters, steam fills the air. An owl swoops past your shoulder, snatching a silver Knut from your pocket. Before you can chase it, a red-haired boy bumps into you, apologizing with a smile. Behind him stands a bespectacled boy—the scar on his forehead glimmers faintly in the sunlight. You know the fate of this world has shifted, and your choices will determine who the true Chosen One really is.