"In the words, Isidor. That's where the magic hides!" It's the best, the most important job in the world. The big dream of little Isidor: to also guard the invisible rope of the moon. To tirelessly patrol the rooftop, to test the rope with his hand to see if it's tied well... Bella does it every night! But the magician Livorno always tells him no. He fears that the knot will untie and the moon will drift away. And then, goodbye world. The caliph will not pity them. But Isidor has made up his mind. He will become the guardian of the moon, come what may. For one night. Even for one night... A story about dreams, friendship, struggle. And about the miracles that spring from our words and embrace the entire Earth.