Zero to hero
(Book)

"Billy Broccoli wants a lot of things: to be accepted in his new school; to be cool; to have his stepfather stop talking about dental floss. But the one thing he never wanted was his own personal ghost. So imagine his surprise when he ends up sharing a room with Hoover Porterhouse, a funny teenage ghost with a major attitude. When an obnoxious school bully sets out to demolish Billy, the Hoove comes up with a plan for revenge. It's all in the Hoove's rule number forty-two: No matter what, stay cool. Like it or not, Billy and the Hoove have to stick together if Billy ever wants to get in style, get even, and conquer the school."