I looked in the jail and talked to the inmates but the guy says he will…

I looked in the jail and talked to the inmates but the guy says he will cut out ur tongue and the witch is in there. The guard just talks about how they keep brigands and filth down there. Can someone please help me find Jack? Is there something I have to do before I can get him? I do not know how to bribe the guard with money. Help!!!!!!!