Carlie Bennett, Jamie Bennett's granddaughter, wakes up one morning to find that Jack Frost has written on her window. Then, after becoming close to him in a year, she dies--but her family can still see her. Carlie isn't like Jack, North, or any of the other Guardians though. She's just a spirit. Of what? She doesn't know. But Jack gets himself into trouble again, more than usual, and someone even more powerful than Pitch Black appears, seeking revenge on them all. Jack and Carlie have to fight for their love, because he isn't going away until he takes away everyone that Jack loves, just as Jack did to him.