Tia Scott, 17, had lived a relatively typical existence until a hit-and-run killed her elder sister. That is, until she develops weird symptoms and discovers she has contracted a virus that progressively turns her into a zombie. To discover a cure, she only trusts a school loner, Flynn, a self-proclaimed expert in all things paranormal. But Tia's situation gets even worse when Connor's friend is murdered. She enlists the help of her mother Kate and a reclusive doctor to stop the disease before Jason finds out she's snitching.