They have built mountains, forests, and seas and filled the world with animals, people, and unnamed beasts. Now their days are fat with long naps in the clouds, mutual admiration, and tea and cake. But their world has gaps in it filled with emptiness, gaps that intrigue Harry, Sue, and little Ben until they begin to see what might fill them. One by one the children conjure, from twigs and leaves and stones, a mousy thing, a chirpy thing, and a twisty legless thing. But as the children’s ideas grow bolder, the power of their visions proves greater and more dangerous than they, or the gods, could ever have imagined. Is it possible to unmake what’s been made?