While I’m not planning to go into a lot of plot details, it’s likely that the random mutterings that follow will reveal some things you might prefer not to know if you haven’t seen the episode yet, so in my usual way, I’ll include this warning:
What’s this? A haunted house story? Weeeeeeeelll, sort of. In a “not exactly” kind of way.
Bill and a bunch of students are looking for somewhere to live, and after some disappointing viewings, they’re delighted when a chance meeting with an only slightly creepy landlord leads them to signing a contract on a nicely gothic mansion which the Addams Family might like.
The house has a tower that doesn’t have any obvious means of access, no mobile signal, power sockets from a previous generation, and some very odd noises. And the creepy landlord seems to appear and disappear at will.
So, when the Doctor ignores Bill’s protests and helps her move in, he gets the feeling that there’s something not quite right about the house.
And indeed there is. Or do I mean isn’t? Either way, it’s not quite the bargain it appeared to be, what with one of the students not having been seen for a while, and strange insects appearing, not to mention the little detail of the doors and shutters all sealing themselves. And of course, all the fun takes place at night with a thunderstorm crashing around the house, in the finest tradition of such things, as people are picked off one by one in a suitably nasty manner.
Much of the usual chasing around follows, with a resolution that certainly wasn’t what I was expecting. All very nicely done.
There was more fun with Bill getting to know the Doctor, with her finding the idea of him being a Time Lord more than a little ridiculous.
And then it was back to the Vault. Having chased Nardole away, the Doctor talks to whatever (whoever?) is in there, and tells it (him? her?) that he’s coming in…
Having seen things in trailers, and having certain guest actor details revealed, there is a suspicion about the content of the Vault that I won’t mention just yet, if only for the questions it’ll raise about just why the whatever/whoever is in there and the nature of the Doctor’s Oath…