One day, a little king was  walking in the forest of his little kingdom and spied an extraordinary  creature, white as snow and fast as the wind. The little king orders the  knight Littlefoot to bring him the creature, but he fails. The little queen  however manages to bring the unicorn to the castle. The mythical beast,  although well cared for, falls sick. What could make her better?    Based on the book La Licorne by Martine Bourre (École des loisirs).