Summer, 1940.
Hitler's army is advancing towards Paris, and millions of French civilians are on the run.
Amidst the chaos, two British children are being hunted by German agents.
British spy Charles Henderson tries to reach them first, but he can only do it with the help of a twelve-year-old French orphan.
The British secret service is about to discover that kids working undercover will help to win the war.
For official purposes, these children do not exist.
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Read MoreIt has the feel of something quite big and satisfying... Muchamore's voice is fresh and direct. - Daily TelegraphMuchamore's plain, punchy, often funny style ... is highly effective... This clever, tense novel is a great way of getting bored boys interested in history. - Amanda Craig, The TimesThis book was un-put-downable. It gripped me from start to finish, and was just as good as the CHERUB series, if not better! - Aaron, 14, First NewsGripping and compelling - - CarouselIt has the feel of something quite big and satisfying... Muchamore's voice is fresh and direct. - Daily TelegraphMuchamore's plain, punchy, often funny style ... is highly effective... This clever, tense novel is a great way of getting bored boys interested in history. - Amanda Craig, The TimesThis book was un-put-downable. It gripped me from start to finish, and was just as good as the CHERUB series, if not better! - Aaron, 14, First NewsGripping and compelling - - Carousel