Once you get back to shore and if you've saved Curnow, Callista will be waiting for you and give you an item that's worth 100 coins. Afterwards, go and talk to Havelock and Pendleton, who mention some things and urge you to get some well-needed rest. If you look around, you must go to your bed yourself.
After you wake up, you will need to talk to Havelock, who mentions that someone heard something from the sewers underneath the pub. He wants you to investigate, so unlock the grate nearby and go down. Follow the path around until you encounter the Weepers, who are those infected with the Rat Plague. If you're doing this nonlethally, use Sleep Darts (don't forget about the two Runes down here).
Once they're disposed of, head back to the surface and go and talk to Havelock again. Martin has arrived and they have found out where Emily is being held, at the Golden Cat of all places. Of course, the Pendleton twins are also there, so they want you to kill the twins and rescue Emily. Go talk to Treavor by the docks, then to Samuel to start your next mission.
