The Ghost of Raven Hill (Raven Hill Mysteries)

Mystery and adventure are the last things Liz has in mind when she forms Teen Power Inc, Raven Hill High's own job agency. All she and her friends want to do is make some money, and they'll do just about anything. But mystery and adventure are both in store. They are soon confronted with a puzzle they just have to solve. With a little help from the Raven Hill ghost of course!