Everything is great in Noel Hawthorne's life. He's an only child, popular and his tenth birthday is right around the corner. Then, he meets a an ugly, purple monster named Spook living in the basement and his world is forever changed. The monster wants something from him--his life. Spook wants his parents, his toys, his friends--even his body. Noel has one day to stop Spook from trading bodies with him or he'll be stuck as a big, smelly monster for the rest of his days.