From the back of the book:
No Mortal May Enter The Great Dragon Graveyard
Something has gone terribly wrong in Dragonfall, the fabled graveyard of the dragons. The eternal guardians are not at their post, and some have even been spotted attacking local villages. Their job is to watch over the sacred site of Dragonfall, but who will guard the guardians?
Guardians of Dragonfall is a journey adventure for 11th-level characters compatible with the world’s most popular fantasy roleplaying game. This adventure includes details on the great dragon graveyard and the surrounding Bone Field, as well as statistics for all of the villains bent on taking control of the sacred mountain.
This adventure is set in Dragonfall, a remote mountaintop in the world of Golarion, part of the PATHFINDER CHRONICLES campaign setting. It can be easily adapted for use with into any world.