World War II has begun. Brigit has been evacuated to Wales from her home near the aeroplane factories of Coventry. But when it’s revealed that her father is German, Brigit runs away to join her mother in a very special training camp, where Churchill is building a secret army of spies and saboteurs known as the Special Operations Executive. Brigit and her mother soon find themselves on the front line in Nazi-occupied France, where they search for double agents and meet with danger at every turn in their efforts to support the French resistance. But no-one will suspect Brigit is a spy, will they? After all, who would suspect a child?