David is back in Quentin's toils again. How do you keep a ghost from possessing you? Maybe Professor Stokes has an amulet that would do the job, but I doubt it. I think that if David had not gone to Quentin's room, but had instead met him in a place that wasn't Quentin's home turf, then maybe Quentin wouldn't have re-conquered him so easily, but Quentin still would have triumphed in the end.
I like seeing Maggie being tough, as she was with David. It's distressing to see her frightened so easily after that, but the ringing of the telephone would have scared me, too. She's handled that phone, and she knows there are no batteries in it.
I liked the next-to-last few seconds of the show, when Maggie was walking towards the storage room and the thunder was rumbling. It was just the perfect Gothic scene.