One boy's special relationship with the whale that swam up the Thames provides a powerful plea to save the environment. At sunrise, young Michael spots a whale on the shores of the Thames and thinks he must be dreaming. But the creature is real and brings a message for him - humans must mend the damage they are doing to the planet before it is too late. But how can Michael fulfil his promise to tell others when neither his teacher nor his classmates will believe his story?