Cliffside Roach Motel

from the introduction:
This adventure pits a party of four 2nd-level characters against an insidious cult that has taken up residence in Sharn. When the party stumbles across a ramshackle inn located on the cliff face of the Cliffside district of Sharn, a simple investigation into a pest problem quickly blooms into full-fledged adventure.

To get the most out of this adventure, you need copies of the following D&D books: Player’s Handbook, Dungeon Master’s Guide, Monster Manual, Eberron Campaign Setting, and Sharn: City of Towers.