A young boy dominated by an unusually large nose and a tendency to turn pale when frightened struggles with shame and mockery while trying to overcome deep cowardice. Family reprimands, the counsel of older acquaintances, school life, friendships, and a series of comic misadventures prompt experiments in bravery, self-defence, and self-presentation, including a striking new coat that affects his conduct. Interludes of scientific reflection about his nose and encounters with animals and rivals test him, leading to a climactic physical confrontation and a gradual reassessment of courage and character.