In the heart of the ocean lies an island inhabited by extraordinary sea creatures. Among them is little Rufus, who, however, is different from the rest of the inhabitants. While everyone loves the waves, Rufus prefers to dream alone on the shore. And that's because... he can't swim. When his beloved Uncle Louis loses his magical powers and danger looms over the island, Rufus must do something that truly terrifies him: enter the water. Will he find the courage to overcome his fear and save his friends?