From the Publisher's Website:
When a Pathfinder team in the godless nation of Rahadoum disappears, the Pathfinder Society sends the PCs to investigate. Deep beneath the sands of the small village of Wadi al-Hesr, a long imprisoned evil - responsible in part for the destruction of an ancient empire - now stirs and threatens the entire region with a deadly plague. Can the Pathfinders survive a sinister game of cat-and-mouse and escape with their lives?
Where Dark Things Sleep is the second scenario in the The Heresy of Man campaign arc. It is the sequel to Pathfinder Society Scenario #2-06: The Heresy of Man - Part I: The First Heresy and is followed by Pathfinder Society Scenario #2-09: The Heresy of Man - Part III: Beneath Forgotten Sands.
This product is a Pathfinder Society Scenario designed for 5th to 9th level characters (Tiers: 5-6 and 8-9). This scenario is designed for play in Pathfinder Society Organized Play, but can easily be adapted for use with any world.