From publisher blurb:
Demons have been released!
It’s finally happened! The Demoncall Ritual has begun, and creatures from the Abyss are streaming out through the Cellend family crypt. Heroes are needed, not only to slay the demons and stop the ritual, but to accept the risk of reversing the ritual to seal the Demoncall Pit forever. The Demoncall Pit is a 7th level Pathfinder Roleplaying Game adventure of diabolical treachery!
Demoncall Pit is an adventure for 7th-level characters. Written by John Ling, with stunning coverart by Marco Morte, this adventure is compatible with the Pathfinder RPG and [Gaming Paper Adventures: Mega-Dungeon 2].