if i remember right when i did this:
did the first option, ask him if he would write down the demons name if i ask him. he gave a look/groan saying no.
mindread him, he thinking that he wants to read (last option on book case) certain thing tonite.
went to book case and choose that, heard click and wall goes away.
there a chest with demons name in it(cant open yet)
go next floor up and explore and beat up mob there(key drops off mob or located in area were you first walk into area:center area that separates both sides, cant remember which)
go back down stairs and open chest(read note/book) yay demons name.
oh i think the slave at basement level tells me about non speaking guy first(after i helped him). dont know if that needed to enable the mindreading for nonspeaking guy.
only problem is when I choose any option 1st or 2nd the mind read option isn't there nor the book
