From the back of the adventure:
Fighting in the StreetsThe orcs of the High Forest living in Loudwater are angry and out for blood. Orcs are being murdered in the streets of Loudwater, and no ones seems to know who's responsible. Can heroes succeed where the city watch failed?
Rat's Bastard is an adventure for the Dungeons & Dragons (3.5 Edition) game. It can either be played as a stand-alone adventure, or as part of the LGR - Legacy of the Green Regent™ campaign offered by the RPGA. Designed to challenge 4th-level D&D heroes, this adventure puts characters on the trail of a ruthless killer that wants to tear Loudwater apart.
To use this adventure, a Dungeon Master also needs the Player's Handbook (D&D 3.5e), the Dungeon Master's Guide (D&D 3.5e) and the Monster Manual (D&D 3.5e). This adventure is set in the Forgotten Realms game world, and it may also be useful, but not necessary, to also have a copy of the Forgotten Realms Campaign Setting.