The Doctor is forced to travel to Trenzalore, the place of his burial, somewhere he should never go. His friends River, Madam Vastra, Strax, and Jenny are all in real danger.
This is one of the best episodes from this Doctor's era.
I truly truly love the Whispermen, the best creation since the Weeping Angels, totally scary looking monsters, I think they are awesome. Trenzalore itself is brilliantly designed, the decaying TARDIS looks awesome.
Smith is again utterly wonderful, I was mixed about him for a little while, I now found myself devastated that he'd soon be leaving the show, if only some of the writing for him had been better throughout some of this series.
Richard E Grant, of course is sublimely good once again, I had always assumed one day he'd play the Doctor, maybe he'll return as the intelligence on day.
I love all of the references back to the previous Doctors, as well as Clara's involvement. The solution about Clara's being is also a truly satisfying one. The loose ends feel like they've been tied up.
I've read so many of the reviews, each and every one interesting, for me Series 7 has been the most disappointing season yet, so many below par episodes, so many that could have been great but always missed the mark, Asylum of the Daleks being the exception, that was amazing, then I saw this, what a totally wonderful episode.
10/10 sheer brilliance from start to finish.