From the back of the book:
Demons in Space
For millennia, a complex plot has brewed in a demonic jungle on the surface of the moon—a plan by the patient and sinister succubi of the Moonscar to kidnap and brainwash the people of Golarion. Now a long-dormant portal linking the moon to Golarion has returned to life, accelerating the demon queen’s designs. Only the brave PCs can venture to the surface of the moon, navigate the treacherous Abyssal jungle called the Moonscar, and delve into the depths of the Insatiable Queen’s subterranean palace of torture, seduction, and depravity. Can the heroes rescue the kidnapped people of Golarion and return them to their positions of power and prominence, or is it too late for the unfortunate victims of the demon queen of the moon?
The Moonscar is an adventure of extraplanetary exploration for 16th-level characters, written for the Pathfinder Roleplaying Game and compatible with the 3.5 edition of the world’s oldest RPG. This volume also includes a gazetteer of a wilderness region of Golarion that contains a gate to the moon amid the ruins of an ancient astronomical research station, a detailed dungeon complex beneath the surface of a lunar jungle, and a brand-new space monster, all of which can be easily adapted for use in any campaign setting.