In this final installment of the series, Kim Cruz, part of an ancient race of humans that change their form every year, has just come out to her best friend. She finally opens up to all her friends about who she really is and deals with the aftermath. Then she begins to prepare for her last change. When she changes again, she has the body and social status of her dreams; with this comes privilege, opportunities, and popularity. However, with the new identity comes a future vision that Kim is scared will come true. As she tries to avoid fate, she discovers the type of person she really wants to be, and which of her four changes she wants to be forever.