It's All Downhill from Here (You're invited to a Creepover, Bk. 10).

Maggie Kim's parents have always dreamed of operating their own hotel, so when the historic Wharton Mansion goes up for sale, they see it as the perfect opportunity to open their own ski lodge. This weekend Maggie and her family are going to check it out and perhaps even buy the place on the spot. But Maggie doesn't want to move to a run-down old mansion all the way up on a desolate mountain, and the ghost that lives there doesn't want the Kims there either . . . a ghost that will stop at nothing to get his way.