Eleven-year-old Elin is convinced that she is able to fly, as long as she observes the ten rules. On the basis of these rules, the film shows how she tries to escape herself and reality, where she is considered an outsider.

The fairy tale of the little mermaid begins on a beautiful day when, during a sudden, violent storm, the prince's ship is wrecked with all hands lost. The prince is saved by the little mermaid, who sings a beautiful song for him with her lovely, pure voice. Unfortunately, her father forbids her from having any contact with the human world. Just before the prince wakes up, the little mermaid quickly dives back into the sea. When the prince wakes up, he only remembers a beautiful voice, but whose? The girl with this beautiful voice must become his bride! And so begins the prince's search for his bride. The evil sea witch has heard and seen everything in her magic ball. She thinks this is the perfect opportunity to find a husband for her stupid and ugly daughter. The sea witch devises a wicked plan to keep the little mermaid and the handsome prince apart. Will the sea witch succeed, or will true love prevail?