If you don't mind old school or can convert the material to 3.5 yourself, there was a series of three modules in 2e that were great. They were based around the I,Tyrant supplement. It was great, and the new Lords of Madness would work for it now. The story basically had the adventurers trying to take down a thieves guild. Eventually they discover all sorts of behind the scenes players pulling strings like illithids and beholders. I doubt newer players would have any knowledge of it.
You might be able to find it on ebay or a very popular peer 2 peer site.