Well-worn key quest

After you talk to Myra and say brother to get the quest you're off to the clink. You'll find the clink by going up the hill north of the fire lotus tavern. After you climb the hill and pass the stone gate, the entrance is a man door just around the corner on the right.

When you enter the Clink you'll need to talk to the desk seargeant to enter into the prison area if you head right. If you head left you'll come to a door with 3 levers. Flip all 3 levers go through the door and jump down. Go through the door on the back left as you enter. You'll be in another prison area. There will be a gate in there with a kobold behind it. You'll go through that door, kill the kobold and continue through that area.

Behind one of the doors in the square set of hallways you'll find Myron down inside a pit. Once you reach Myron say. "Your sister Myra sent me", "I have a key for you", "Yes you can have the key".

After saying those things, he'll throw the key down a drain and give up. Now you have to return to Myra.

Tell Myra, "Myron would not leave the prison". She will reward you with 7500 exp and 1000 gold.