After her mother is shot at a checkpoint, fifteen-year-old Sarah meets a mysterious man with an ambiguous accent, a suspiciously bare apartment, and a lockbox full of weapons. He's part of the secret resistance against the Third Reich, and he needs Sarah to hide in plain sight at a school for the daughters of top Nazi brass, posing as one of them. If she can befriend the daughter of a key scientist and get invited to her house, she might be able to steal the blueprints to a bomb that could destroy the cities of Western Europe. Nothing could prepare Sarah for her cutthroat schoolmates, and soon she finds herself in a battle for survival unlike any she'd ever imagined. But anyone who underestimates this innocent-seeming girl does so at their peril. She may look sweet, but she's the Nazis' worst nightmare.