'In exchange for help entertaining her guests on 'spooky' vacations, Alison Kerby told her resident gumshoe ghost that she'd help him on the occasional case. But she didn't think she'd have to go through with it--after all, who goes to a dead private eye? The answer: other ghosts. The deceased Scott McFarlane got roped into a prank that may have killed a prominent local resident. With some