Lucy, a shy girl, is tasked by the king to retrieve the diamond sword from a creepy castle to kill terrible tigers attacking the land. She bravely chooses a path which leads her through dangerous obstacles like a rocky pit with a dragon, a quick sand river she builds a bridge across, and a swamp she decides not to swim through. At the castle, Lucy defeats the villain Gargamel to get the sword. She then uses it to kill the tigers, saving her people, though the story ends with an ominous roar, implying the threat may not be over.