Location: From the barkeeper in the Thirsty Ranger's Inn, open grate and go up, west.
Quest: The old man (one of the thief guildmasters) will ask you to find a key for him. The key is hidden: From where the coach arrives in Tharbad, go all south, two east, open crack, north, reveal key. The old man will have told you that this key was for a warehouse on the southern bank of the river, inside the city; he says that he doesn't want to be bothered with this any more, and that if you find the key, you should use it.
Reward: