What happens when all the world's islands start to fly, seemingly of their own accord? Chaos for the politicians and world leaders, but great fun for the children. When a tropical island lands on a field in the sleepy Devon village of Dunsford, Lucy and Toby Middleton embark on a series of extraordinary adventures that take them to the Mediterranean, San Francisco, the Pacific Ocean, and eventually London, where they are able to help the world leaders solve the immense crisis that the flying islands have caused.