Aha! Thanks alot, kiya!
(You gave Tingalf quest solution... I think... my appologise if there is any misunderstandings).
Risking being reputed as topic-waster, yet foundind, that making new thread on just a stupid question is worse, let me ask you.
In the castle jail there are two connected with each other rooms (but seem not connected with jail itself) NW from guard, and almost MW of map of jail. I can see stairs down in one of them. What is it, how one can reach them?
And is there any way to get to castle from jail (before being Lord Protector and after)?