<p><b>A riveting story of adventure, danger and friendship for readers 11+, perfect for fans of Alex Rider and CHERUB.</b><br><br>What would you risk for a friend you''ve never met . . . ?<br><br>In 1960s Berlin the Wall is everywhere. It cuts through streets, parks, even houses. Teenagers Harry and Jakob live either side of the divide.<br><br>In West Berlin, American Harry witnesses the brutal shooting of a boy trying to escape over the Wall into the West, and decides to emulate his comic book heroes and help those in the East however he can.<br><br>On the other side in East Berlin, Jakob is the adopted son of a high up Stasi officer, feeling suffocated by the rules of a strictly regimented society and desperate to find his real family.<br><br>When Jakob finds a message that Harry has sent over the Wall, he grasps the opportunity. The boys begin a secret friendship, evading the authorities using lemon juice as invisible ink to share hidden messages.<br><br>They soon realise that a bol