It's the first day of a new school for Sam and Sara. So of course they're both hoping to fit in quickly. All they want is a helping hand - some new friends to keep an eye out for them and help them get ahead. What they're probably not hoping for is Thumb. Actually, a lot of thumbs. And fingers. They're turning up all over Freakham High in seriously unexpected places. But why?

Can Sam solve the mystery of the bothersome body parts? Can Sara keep her cool in the face of the dastardly digits? And most important, can they get through the day without being labelled losers by their new classmates?