Santa's Unfinished Business
Cass doesn't do ghosts. Ever. Of course, Gran doesn't take 'go to hell' as an answer when she calls Cass looking for a ride - in the middle of a snowstorm - at 2:00 in the morning. At least Gran provides coffee, and all things considered, Gran goes inside, does her psychic thing while Cass does her thing by staying away from the ghost.
A good plan, really...until Santa shows up.