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Nineteen-year-old Harper has been trapped in a secret underground facility, a combination military school, ward, and laboratory, for the last five years. Memories of her prior life are gone. She's forced to train for combat, and after being condemned as an experimental test subject, an electrifying power begins to rise within her. Harper finally escapes, but not all of her friends get out. Unsure if she'll be able to remember who she is or control her new power, she must find and save her friends from the man who incarcerated her before they fall too far into his operations, and before she's captured again. With the help of a mysterious, fiercely protective and handsome police officer and a crew of determined allies, Harper fights to figure out who's behind the Vault and to get justice.