Sophie Harper has a secret. A peculiar one. By the time she gets to the Academy for Peculiars, she's already killed a man. From there, she learns that the superhuman strength she was born with and abandoned because of means she's a peculiar - a human with abnormal DNA - yet that same strength alienates her from her peculiar peers because of its rarity. As she settles into her new home, she makes friends with her dorm mates, stresses out about catching up with schoolwork, and starts dating one of the most popular guys at the academy. Normalcy is what Sophie wants more than anything, but she can't change the fact that she's different, even among peculiars. She starts falling for her infuriating trainer, a rugged shifter named Will, despite the fact that it's forbidden. When she finds out there's only one other man with her physical strength, she yearns to learn more about him - yet he's someone everyone refuses to discuss. She starts to realize that being a peculiar means more than just being strong, and that just she shares her ability with her mysterious counterpart, it doesn't mean he isn't a threat.

Those that aren't lost can't be found. After the whole ordeal at the underground Catalina nightclub, Sophie is ready to forget about everything and enjoy the holidays with Will in Washington. As the weather cools down, things between them heat up. But Sophie is still with Jason, and she can't easily forget that. On top of that, Sophie receives a letter from her parents wanting to meet and asking for her forgiveness. When Jane Cabot, her best friend, is mortally wounded by an unknown assailant, Sophie must question everyone and everything around her in order to bring her best friend to justice. Things don't add up, however, and despite Jane being attacked, Sophie is the true target. When she gets taken by a familiar face, pieces of a puzzle start to fall into place, and she's not sure she wants to be found.