From the back of the book:
A Rain of Death
The black clouds of war are gathering, and evil flocks to their thundering call! While seeking the legendary expertise of a cloud giant skymage, the PCs interrupt an attack on his lair by well-armed and magically augmented hill giants. To obtain the cloud giant's arcane knowledge, the PCs must seek out and eliminate the source of the hill giant threat, yet the brutes have little information other than the name of their employer—a mysterious giant calling herself the Storm Queen, whose anger and hatred have transformed over the course of years into a murderous plan that could cost hundreds of innocent lives. Can the PCs find the Storm Queen in time to prevent her from unleashing a horde of vengeful ghosts upon the world?
Curse of the Riven Sky is an adventure for 10th-level characters, written for the Pathfinder Roleplaying Game and compatible with the 3.5 edition of the world’s oldest RPG. Authored by novelist and legendary game designer Monte Cook, this adventure features angry giants, slimy horrors raining upon an unsuspecting city, and cursed spirits willing to bore a hole through reality to fulfill their strange desires.
This adventure is set in the Viking-inspired Land of the Linnorm Kings in the Pathfinder Chronicles campaign setting, but it can be easily adapted for any game world.