After her mother is shot at a checkpoint, fifteen-year-old Sarah--blonde, blue-eyed, and Jewish--finds herself on the run from a government that wants to see every person like her dead. Then Sarah meets a mysterious man with an ambiguous accent, a suspiciously bare apartment, and a lockbox full of weapons. He's a spy, and he needs Sarah to become one, too, to pull off a mission he can't attempt on his own: infiltrate a boarding school attended by the daughters of top Nazi brass, befriend the daughter of a key scientist, and steal the blueprints to a bomb that could destroy the cities of Western Europe. With years of training from her actress mother in the art of impersonation, Sarah thinks she's ready. But nothing prepares her for her cutthroat schoolmates, and soon she finds herself in a battle for survival unlike any she'd ever imagined.