Need help with quest!, quest: Canvas the castle Options

[Nilsi]

I need some help with a quest.

It is the quest: Canvas the castle. I am going to investigate the count hall in cheydinhall for a thief that has stolen a picture from the countess. First I have to talk to some suspects and then I am going to find clues. I have found 1 in Chanels lectern in her room. And after that it sais that I have to find more clues. I have searched for more clues for a very long time now but i cant find any more. When I try to acuse some of the suspects they just says that I dont have enogh evidence! Can somebody help me???

Thanks for all answers