Tyrion gets rescued by Jaime and Varys. It looks like it will be a heartwarming brotherly reuninion (they do seem to get on pretty well for Lannisters). Then Jaime tells Tyrion the big secret: Tysha wasn't a whore after all. The whole thing was made up because Tywin thought she married Tyrion for the money. Tyrion is angry at Jaime for some reason (because I doubt Tywin gave him much choice). So he sends Jaime packing, telling him he did kill Joffrey (which just annoyed me because it is not helpful for anyone to lie about that).
Tyrion meets Varys who leads him down some tunnels. Then, against Varys's advice, he climbs a ladder, learns that Varys probably gets most of his information by listening through thin walls of secret passages, and kills both Shae and Tywin (while he was sat on the privy, no less). Tywin did not see that coming. And neither did I.
So who's in charge of the Seven Kingdoms now? Cersei? Good grief what a kerfuffle this is going to cause.