My daddy says there's a hole in our roof. I know why there's a hole. There's a hippopotamus on our roof eating cake.' This classic story about one of the largest and most famous imaginary friends has been delighting children around the world now for 30 years. To celebrate the 30th anniversary the original hippo story has been republished in a hardback gift edition with a special sparkly hippo on the cover, ready to delight a whole new generation of children.