The Mystery of Merlin and the Gruesome Ghost

Rat is going to have to go to school. All kids have to go to school. But Rat REALLY doesn't want to go. Not to any school, no matter who runs it or how cool it is. He doesn't even want to go to Merlin's Institute for the Knowledge of Everything. That is, until Humpty is called to the school to investigate a ghost, and Merlin tells Rat he might be the one to finally pull the sword from the stone. Oh and there is a cute girl named Lily in his class. But I am sure that has nothing to do with it. After all, Rat is the sidekick to the most hardboiled detective in New Yolk City.