James Jacobs - Malevolence

Used paperback.

The house has stood abandoned on its lonely hilltop, brooding quietly over the ruins of a once thriving town for decades. No one has lived within its walls since the night a terrific storm flooded the coastal town below—and since a tragedy struck down the noble family that once dwelt within—but now, the mansion has attracted the attention of a curious group of adventurers. What is the truth behind the tragic past that empowers the evil that grips the mansion today, and what might happen to the world of Golarion if the sinister influences that grow within these haunted walls are allowed to build beyond the breaking point?