Planet of Coppelius : Book 20

On this planet, the sun is so dazzling that some of the inhabitants-the Solarians-lose their colors and start looking alike. Coppelius, the planet's leader, usually performs the Coloring Ceremony to restore the Solarians' colors. But this time, Coppelius seems absorbed by another project-one that could destroy creatures in the shadow lands. Can the Little Prince convince Coppelius to restore the planet's balance of shadow and sunlight?