This was tricky and my memory isn't perfect but I think I can help you. To the right of the eunoch (as you face him) past the railing is what looks to be a red curtain. This is where it's a bit vague but I think you have to click on that curtain to get things going. Sorry 'bout the vagueness but it's been awhile. I know I had a problem with that, too, but I think this is the answer.