When ghost boy Kaz's haunt is torn down and he is separated from his ghost family, he meets a real girl named Claire, who lives above the town library with her parents and her grandmother. Claire has a special ability to see ghosts when other humans.
Kaz, who is an ordinary ghost, is separated from his family when a wind carries him to a library, where he meets Clarie who can see him. When they hear strange noises in the library, they decide to investigate.