After you have completed Murders in Ferdok, talk to Salina and her brother Hamlok. Salina wants you to free Dranor from the prison, because he is innocent. There are tunnels going to the prison form the Ferdok Brewery cellar, and luckily(for once) there is a rat infestion in the cellar. Talk to Moddlemush(Caretaker Muddlemosh`s brother) about it, and he will let you in to the cellar. Go back to Salina, but she isn`t there, but Hamlok is. Tell him to tell Salina that Dranor is released, and the quest is over.