A wonderful new picture book from the bestselling author of The Tiger Who Came to Tea and Mog the Forgetful Cat. When the water in Katerina's pond begins to disappear overnight, she makes the wise decision to follow the leak, and leads her family into an exciting underground adventure. Who knows where the geese will surface next? Meanwhile, the villagers try to solve the problem of the empty pond, and only little Millie Buswell seems aware that its inhabitants are missing too! Will she ever see her favourite goose again?