From the back of the book:
The Dead Will Rise
Deep below the anarchic city of Kaer Maga, someone—or some thing—has begun stealing corpses from the city’s most prestigious tomb, the Godsmouth Ossuary. Fearing the worst, the clerics of Pharasma in charge of maintaining the crypts quietly call for aid, not wanting to risk their own members in combating whatever horrors may have crept in from the tunnels and hidden chambers of the legendary Undercity. Yet when the PCs venture below the closed-off sections of the crypt, what they find may be more than they bargained for. For beneath the infamous crypt lies a temple from an ancient empire devoted to sin, and a former Pharasmin cleric who’s weathered his goddess’s wrath to create an army of undead minions, their dead flesh standing ready to support his heretical plans.
The Godsmouth Heresy is an adventure for 1st-level characters, written for the Pathfinder Roleplaying Game and compatible with the 3.5 edition of the world’s oldest RPG. It takes place beneath the cliff-top city of Kaer Maga, an ancient prison colony turned den of thieves and refugees, fully detailed in Pathfinder Campaign Setting: City of Strangers. In addition to the adventure, which features ancient tombs, horrifying sin magic, and a crazed alchemist, this module also contains statistics for the new rune guardian constructs and a map and overview of the Godsmouth Cathedral, the city’s primary temple devoted to the Lady of Graves. Though this adventure is set in the frontier region of Varisia in the Pathfinder campaign setting, it can easily be adapted for any game world.