As they climb back into the TARDIS the camera pans down a bit and we see on a tombstone nearby, “Rory Arthur Williams”. Oh no.
Back in 1938 Rory and River are taken to Mr. Grayle’s house where he orders Rory to the basement with “the babies” and River is taken to his office and shown the damaged Weeping Angel in his collection. From clues in the book Amy and The Doctor travel back to the Qin dynasty, 221 BC, to leave a message for River on a vase so she can activate a homing beacon for the TARDIS to safely travel. Upon materialization, Mr. Grayle is rendered unconscious and unable to provide information about Rory’s whereabouts. During the commotion the damaged Angel grabs River about the wrist, proving that the book is coming true when her and The Doctor’s dialog about breaking her wrist to free herself appears in the book. Worried about spoilers and creating fixed points in time Amy reads only the chapter titles as clues and discovers that Rory is in the basement, who has been playing a version of “Red Light Green Light” with weeping cherubs using matches.
When she leaves for Rory, The Doctor takes a look at the book and notices the last entry, “ Chapter 12 – Amelia’s Last Farewell” and just flips out. During this scene there is also the revelation that River is no longer serving time in prison as the person she killed no longer existed, thank you again Oswin, and that she has earned her Professoriate. (In ‘Blink” River is an Archeology Professor and is not serving time in prison. Seems she’s catching up to The Doctor’s past and her own future.)
Down in the basement they find that Rory has just been displaced in space, not time as well. After freeing herself, River soon locates Rory nearby in the Winter Quay. As they race to leave The Doctor accidentally grabs River’s supposedly unbroken arm, revealing it is in fact broken as the book foretold.
At Winter Quay, Rory rides the clairvoyant elevator to the 8th floor and is about to enter a room with his name on it when The Doctor and Co. stop him. In the room, they find an elderly Rory on his death bed just before he dies. The Doctor realizes that Rory’s fate is now assured, and deduces that the Angels have used this building many times as a virtually endless battery farm because every time you escape you are brought back and that creates the time energy they feed off of until you die. Rory and Amy refuse to accept that as Rory’s fate, deciding instead to try to create a paradox to make it all “unhappen”.
As Rory and Amy make a run for it they are forced to the roof where if you’re not ready to cry then just stop right there and just stop. Because it’s about to get real.
On the roof Rory and Amy come face to giant face with the Statue of Liberty and with no were else to run Rory tries one desperate attempt: he stands on the ledge of the building saying that if he falls he dies here and now not as an old man in the room, it would create the paradox. He tries to assure Amy by saying that he’s died several times and always manages to come back, but he just needs a little push because he can’t bring himself to do it.
Amy tries to talk him down asking if she was in this position could Rory give her the desired push. He responds with, “To save you, I could do anything.” And cue the water works.
Amy gets on the ledge with him, saying that they go together or not at all. The Doctor and River make it to the roof in time to see the Ponds jump. As they fall the place starts to come undone. The paradox is working.
The four find themselves back at the graveyard in the present, as if nothing had happened, though the Doctor notes with the paradox, he can no longer travel to that point in time. As they are about to leave on a family outing Rory spots the tombstone with his name on it and then vanishes as he is touched by a surviving Angel. Distraught, Amy rationalizes that if she were touched by the same Angel, she would be able to join Rory in the past. The Doctor tries to talk her out of it saying it would be a fixed time and couldn’t go back for them but River insists she goes. Amy tearfully says goodbye to The Doctor and River before letting herself be touched, her name appearing on the tombstone under Rory’s.
With River in the present, the Doctor realizes that she has to deliver the manuscript to Amy for publishing in the past and goes to retrieve the last page of the book with the afterword. On that last page Amy gives him the advice to not travel alone and asks him to go back and tell her younger self stories of the adventures she would have in the future.
The end is young Amelia Pond waiting outside her house in the garden waking up to the sounds of the TARDIS materializing as previously seen in “The Eleventh Hour”.