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.

Can he fulfil his promise to tell others when neither his teacher nor his classmates believe his story?

Michael Morpurgo has published over 90 books, and has won numerous awards including The Whitbread Children's Book of the Year and the Smarties Prize. He was Children's Laureate between 2003 and 2005.