Phantom at the funhouse

The G.H.O.S.T. Squad's school is having its annual carnival, but something isn't right this year. Something creepy is lurking in the funhouse. Guests are spooked and refusing to come to the carnival. If Mags, Scarlett, and Luna can't solve the case in time, their school won't be able to raise the money it badly needs. The problem is, how do you get a ghost to move on if they don't want to leave?.