The Watch are some of my favourite Discworld characters, I love Sybil and the Patrician as well, who always feature in the watch books. I didn't remember the plot of this one either (has it really been so very long since I last read any Discworld books?), which made it rather more enjoyable. I do remember who Carrot is, though, and the results of Vimes and Sybil meeting. I particularly enjoyed the Patrician's approach to dungeon-building, which I should remember if I am ever in a position to do that sort of thing.