You got into the battle tower (bandit camp entrance, not the locked one by the teleporter), and had the cutscene with the undead Sassan? If you didn't get the cutscene, then head back outside and finish off any remaining bandits.
If you are not past the cave-in, check out the hidden storage room in one of the cells (diagonally opposite the prisoner). If you look on the map it should be obvious which wall is false. There are 2 small kegs of explosives once you get past the 2 false walls; one can be used to clear the cave-in, and the other shortly after that to open a short side passage.
If you made it to the elevator, head down to the basement to get a key off an opponent to open the door on the floor above the ground floor. If you made it that far, did you mindread the mute goblin? Read the book he was thinking about, in the bookcase on the other side of the room (you may need to scroll down to see the end of the list).
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