I want to heartily thank the folks on this forum. I used much of the thread concerning Balabar Smenk's estate to form the raid my players staged recently.
I made a few additions:
1) Balabar Smenk supposedly leaves town for Greyhawk to validate his claim on the Dourstone mine (see #3 below) and to hire a new mine manager, since the last one was decapitated by Grimlocks.
2)Smenk hires a band of thieves called 'the Black Talons' to kill the PCs by luring them into a farm house with 2 cockatrices, then disguised as a neighboring farm family they try to slit the PC's throats. They are hired by Smenk, but know only an intermediary in Greyhawk.
3)Dourstone had a dwarven bodyguard whom Smenk bribed. While the PCs raided the Ebon Triad, the bodyguard beats up and drags off Dourstone to give to Smenk.
4)Smenk claims that before Dourstone and his bodyguard left town Dourstone sold his mine to Smenk.
5)The other mine owners smell something rotten and have a man watch Smenk's estate constantly. Eventually he sees Dourstone's former bodyguard leave Smenk's estate, and return an hour later. The spy sells this information to the other mine owners and the PCs.
6)The PCs raid Smenk's estate, since the dwarven PCs wish to find Dourstone on behalf of the Greysmere Covenant. The bodyguard knows that Dourstone is below the house in catacombs occupied by Smenk.
7) The PCs find Dourstone barely alive, and Smenk escapes barely. Amongst Smenk's coffers they find evidence incriminating Smenk and Mayor Neff. In this case Mayor Neff was spurned by a sorceress for whom he had formed an unhealthy obsession. Smenk arranged for the woman to be captured and petrified, then placed in Mayor Neff's garden. The knowledge of the crime put Neff squarely in Smenk's pocket.
If the PCs win they find a scroll of Break Enchantment in Smenk's treasury to unpetrify the sorceress Mere.
Note: The plot between Mayor Neff and Mere the Geomancer dates back to the Doom Grinder module so I'm not making it up completely.