This was an amazing book that I read. The book is set in WW|| occupied Europe. C.H.E.R.U.B (Charles Henderson’s Espionage Research Unit B) is a group of covert spies who are all children trained, gathered and run by Charles Henderson. The characters are Troy, an orphan who while trying to protect his brother was abused by his orphanage and rescued by C.H.E.R.U.B. Then there is Marc, a kid who rescued the founder of C.H.E.R.U.B after running away from his orphanage and helping become the first C.H.E.R.U.B spy. Rosie and Paul, brother and sister who escaped from the invasion of France to be recruited by C.H.E.R.U.B. Those are all the characters. In The Secret Army, C.H.E.R.U.B gets trained to parachute and goes on their first training exercise.