Witches Tower

Ive been messing around in the witches tower for a few hours and ive tried everything... tried all walls for fake ones, used all torches, pictures etc, killed tower gaurd and im starting to think that its bugged... maybe its not but in 3 hours i should have found something to lead me to the next part of the tower and im totally stumped lol

the area is made to be difficult to discover, this is to keep the witches from above from coming down and terrorizing the good folk of aranock. Keep trying, i am sure with a little luck and persistance your find your path.