In this book you will find: * A Unicorn who is very annoyed to find himself stuck in a zoo. He is plotting his escape while playing tricks on the visitors. * A Princess who is planning to ride the Unicorn on her tenth birthday. She wants to escape too: from her bossy Governess, her guards, her tutor - and from mathematics. * A scruffy Boy who looks after the Unicorn and is cheeky to pretty much everyone, but especially to the Princess. * A lot of exciting or wickedly funny things you weren't expecting to happen!