From an online walkthrough,
quote:
Nalia Needs Help
After having completed her first quest, Nalia will hear of a funeral that is to take place for her father. Head to the Graveyard District and talk to the people there. You'll have an odd meeting with Isea, her ex-fiancŽ. Leave the area.
A while later, he'll come back and arrest Nalia. An informant tells you some information about Isea and tells you how to expose him and save Nalia. It's a good thing this guy comes around!
Your first stop is the Docks district. Go down to the Sea Bounty Tavern and search the area just outside it for a man named Barg. Talk to him and he'll reveal that he is associated with some slavers. He himself is a pirate. Then head to the bottom floor of the tavern and talk to Officer Dirth. Mention Isea's name and he'll attack you. Kill him and pick up the scroll.
Now head to the Government district. Enter the house on the left - Roenal's Estate. Search the chests to find his tax records. Head to the city hall and give the three pieces of evidence to Corgeig. Upon giving him the third piece of info, Nalia will be back in your party! Yay!