A poor boy named Theodore accidentally sneaks into the palace, where he meets the young Prince Philip. The prince believes in an old legend: high above the clouds, the sun still shines, and beyond the mountains, there is another world.
When the powerful Chancellor Zinnober tries to stop the prince from uncovering the truth and preserve his own power over the kingdom, Theodore is drawn into a dangerous and funny adventure. Along the way, he encounters talking animals, an eccentric witch, a poetic cat, ingenious flying machines, a blind girl named Nina, and a secret that could change the fate of the entire valley.
It is a story about friendship, courage, and faith in something no one has ever seen. A story about the idea that even when the sun is hidden behind the clouds, it still exists.