This book has been graded for interest at 9-13 years.

This book was published 2014 by Aladdin Paperbacks .

Christopher Samuel Youd was a British writer best known for his science fiction published under the pseudonym John Christopher. His many novels include The Death of Grass and The Possessors. He won the Guardian Prize in 1971 and the Deutscher Jugendliteraturpreis in 1976, Youd also wrote under several other names including Stanley Winchester, Hilary Ford and Samuel Youd.