Shortlisted for the Costa Children's Book Award 2018.Sarah has played many roles. Dutiful daughter. Talented gymnast. Persecuted Jew. Lost orphan. But now she faces her most challenging role of all. Now she must become the very thing she hates. For the only way she can survive as a spy at a boarding school for the cream of Nazi society is to become a monster like them. A monster who can destroy them.Discover the girl who can beat Bond and Bourne at their own game, in this utterly addictive thriller from a jaw-dropping new talent.