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Skylar Hensing is a nerd. She is remarkably unpopular, unnoticeable, and boring. Ansley Adams is the best fighter in the world. No one knows she's only a teenage girl. No one knows that they are the same person. And especially no one knows that Ansley isn't even her real name. Nor is Skylar. She is a mysterious girl, and the secret she is keeping is deadly. When Donny, a boy from Skylar's school, enters Ansley's life, too, things get immensely more complicated as Skylar tries to keep her secret life a secret from her city, and her even more secret life a secret from the whole world.