It expressly follows the escape of Marc Kilgour , a British spy working for the organisation CHERUB during the Second World War who was moved to a German labour team in Frankfurt in the previous book .
The Prisoner is the fifth book in the Henderson 's Boys series .
Henderson 's Boys expressly follows the escape of Marc Kilgour , a British spy working for the organisation CHERUB during the Second World War who was moved to a German labour team in Frankfurt in the previous book .
The Prisoner is the fifth book in the Henderson 's Boys series .