Henry Grim is a servant boy at the Midsummer School—until he passes the elite Knightley Academy exam and suddenly finds himself one of the first commoners at the Academy, studying alongside the cleverest and bravest—and most arrogant—young aristocrats in the country. They thwart Henry's efforts to become a full-fledged Knight of the Realm, but he and two commoner classmates are determined to succeed. In the process, the boys uncover a conspiracy that violates the Hundred Years' Peace treaty—and could lead to war! Can Henry manage to save his school and country from their enemies—and continue to study at the Academy?