A young boy named Peter lives with his grandfather in a small town. Peter struggles with feelings of being different after being orphaned during the war. His sense of isolation is exacerbated when he discovers that his hair has turned bright green overnight. This unusual transformation immediately draws unwanted attention and suspicion from the people around him, who are confused and, in some cases, hostile towards his new appearance. As a result, Peter becomes the subject of ridicule and bullying from his peers, making him feel more alienated. However, a few adults, including a sympathetic teacher and a compassionate doctor, try to help him understand that being different is not necessarily bad and encourage him to embrace his individuality.

As Peter grapples with society's reaction to his green hair, he faces increasing pressure and scrutiny, which leads him to question his place in the town and in the world. The townspeople's fear of what they don't understand drives much of the conflict, reflecting broader themes of prejudice and acceptance. As Peter's journey continues, he learns valuable lessons about empathy, self-acceptance, and courage. The narrative delves into the psychological impact of societal judgment on children and the importance of supportive relationships. The story moves towards a conclusion that encourages reflection on understanding diversity and the power of kindness in overcoming prejudice.