Follow a three-month-old baby whale on a magical journey down one of the Earth’s great ocean highways to discover the incredible world of ocean currents. She will never know it, but as she swims with the flow of the current, her story becomes inexorably connected to our own. Ocean currents are hidden marine rivers that flow around the Earth. They are responsible for the fish we eat, the rain that feeds our crops, the snow that covers our mountains - even the air we breathe, and they have been helping to keep the temperature of our planet just right for life for millions of years. As our young whale goes with the flow of the current on a great migration from the warm tropics to the frozen ice floes of Antarctica, she meets the curious creatures that call the current home.