It sounds like I have the opposite problem of everyone else in this thread. My Louis disappeared. I spoke to him in the inn and declined his quest. Later, speaking to a man in the prison gave me the quest anyway. The first step (accepting the quest from Louis) is marked unfinished, but he's not in the inn anymore. The quest tracker tells me to go to the inn, and there is an arrow hovering over the spot where he is supposed to be standing, but he is nowhere to be found.