Nine year old French girl Lysette is thrown into the chaos of war when she runs for her life from a bomb dropped on her neighbourhood in Aachen, Germany.  Travelling through the Netherlands, then a long trek through Belgium, she arrives in the town of Sedan in northern France where she is taken into a monastery. There, she is sheltered from the horrors of war. But outside, the war rages on.

Local resistance groups fight Gestapo soldiers, and secret messages are sent across northern Europe and Belgium Closer to home, the Gestapo are searching for ‘the girl in the blue uniform’ after Lysette had witnessed a murder whilst in the Netherlands. The reality of war is contrasted with the calmness of the monastery. Will Lysette ever see her parents again?