I'm looking for good adventures that pits the party against a (preferably) hidden cult in an urban setting. If the cult is devil worshipers or similar, even better, though anything will do. An Aboleth/Far Realm cult is also great!
The party will be unravelling the machinations of the cult of Asmodeus in Neverwinter/Waterdeep, so I'm looking for great adventures to use/steal from. I know of the Living Forgotten Realms adventures for 4E that are Asmodean cult based (those taking place in Neverwinter and Waterdeep), and knoe the Monte Cook adventure "Night of Dissolution".
It doesn't have to be a devil cult, edition doesn't matter. Can also be from a paizo adventure path etc. Any suggestions? Thanks.
Oh, and a Mind Flayer plot a la 3E's "The Speaker in Dreams" is of great interest as well.