This book is part of a book series called The Changes Trilogy .

This book has been graded for interest at 12-16 years.

There are 434 pages in this book. This book was published 2015 by Open Road Media Teen & Tween .

Peter Dickinson is the author of over fifty books for both children and adults. He was one of three British writers nominated for the position of the first Children's Laureate and he has won nearly every major literary award for his children's novels.