Finn has always been different, and in the tiny fishing village of Stromhead he sticks out like a sore thumb. Always told to keep away from the water, he's felt that something was missing until one day he dives in and finds that, swimming with the dolphins, he feels completely at home. But his new friends are in danger of being injured by the rubbish that floats out into the water - and now a supermarket is going to release thousands of balloons that could drift out to sea and cause even more da ...