A boy named Blake learns how to leave his body in order to search for the spirit of his dead mother. One night when he comes home, he discovers that another being has taken over in his absence. For years now, he's watched this impostor live the life that should be his. Then his father remarries, and Blake seeks help from his stepsister, Cathy, who possesses unusual gifts of her own.

Cathy can see things invisible to everybody else. A ghostly child. An abandoned house in the woods. And her new stepbrother's bizarre behavior. Discovering that a young boy's spirit can literally shake loose from his body, she sets forth on a daring quest to restore everything to its proper place. But what she can't see is how they're all connected. And what she can't see could kill her.