Elly goes to the beach and builds a very impressive sandcastle with his friends. He uses a plastic lemonade bottle, a plastic drinking straw and a plastic ice cream wrapper as decoration. That night the sea comes in and washes it away. His friends ask what happened to it. He tells them it has?all been washed out to sea?and has disappeared. A little girl explains that plastic does not disappear and it is bad for sea creatures,plants, fish, seabirds and humans. He decides to make another castle with natural decoration. Colourfully presented with beautiful watercolour illustrations.