Nolan carries the emotional weight of the episode, and it is not a small suitcase. There is a generous helping of flashbacks, served cold. A thread left dangling since S01E07 gets tied off at last, neatly enough to make a librarian smile. "We can try, but it's literally all anyone is talking about." is the kind of line people quote at dinner parties to seem mysterious. It is the kind of episode you immediately want to talk about.