When Gerda the blue whale was very small, her mother would sing a beautiful song telling her that if she were ever lost she should look to the stars and they would guide her. When it's time for the little whale to leave home, her adventures take her from the warm waters of the equator to the freezing poles. Along the way she meets clever killer whales, playful penguins, a friendly polar bear and the ancient narwhal. Then one day, the little whale realises she wants to find somewhere to stay forever. How will she know when she's found the right sea for her? With her mother's song in her heart, Gerda follows the stars to a place she knows she can call home.