From the back of the book:
Legacy Of The Lost Pharaohs
An Osirian noblewoman has discovered the lost pyramid of Ahn’Selota buried beneath the shifting desert sands. Hidden within it is a great magic that allowed the Four Pharaohs of Ascension to rule the land. If this corrupt sorceress gets her hands on this power, she’ll bring back the ancient pharaohs and rule beside them, eradicating the current government in Osirion and plunging the region into immortal despotism. With tens of thousands of lives at stake, the only way for the PCs to stop her is to find the source of the magic before she does and destroy it—or steal it for themselves.
The Pact Stone Pyramid is a dungeon-based adventure for 8th-level characters compatible with the 3.5 edition of the world’s most popular roleplaying game. This adventure includes all you need to send your heroes into an ancient trap-filled pyramid, guarded by strange monsters and concealing the secret magic of the millennia-old pharaohs.
This adventure is set in Osirion, the Egyptian-themed land in the Pathfinder Chronicles campaign setting, but it can easily be adapted for use in any world. It can be used on its own or as a sequel to J1: Entombed with the Pharaohs to create a greater campaign arc. For more information on this region, check out the Pathfinder Chronicles Campaign Setting or the Pathfinder Chronicles Gazetteer.