Actually, there was TWO keys there (South of Elrath's house) when I played. One of them is the key to Dr. Elrath's house. But I never found out what tyhe other is for. Maybe it belonged to a door that I lockpicked. <img src="/ubbthreads/images/graemlins/think.gif" alt="" />
Whatever! Don't get in Dr's house while he is still in or he will kick you out and you won't have a key anymore.