A cracking episode in which Doctor Who crashes a Dan Brown novel, has flashbacks to Missy being executed and then gets pretty damn dark. Did it all make sense? No, not really but really it had everything, including the Pope crashing Bill’s date.
The re-mixing old ideas continued apace in this episode. The virtual reality from Silence in The Library, a library like, um, Silence in the Library, religious orders, creepy monks, some sort of Pandorica like thing. The big difference was that most of the loose ends were neatly tidied up by the end. The plot holes were substantial but mainly irrelevant. We don’t know who the bad guys are but there is more of them next episode.
It does look like the three-parter, in this case, is three sequential stories with their own beginnings, middles and ends. This may prevent the usual problems with multi-part Who episodes.