Like all sixteen-year-olds, Leo prefers the company of friends, motorbike rides and music to school. None of the teachers seem to be able to arouse his interest until the arrival in his class of a young history and philosophy substitute who, with his modern methods, helps him see the world with different eyes. In love with Beatrice, the ethereal girl of his dreams, Leo divides the world by colours. Beatrice is the red of love but he is forced to confront his own beliefs and fears when he discovers that the girl is suffering from leukemia, a disease that he links to white, a symbol of emptiness and loss.