From publisher blurb:
Moonlight and Madness!
The famed observatory at Asteria Point has long endured upon its mountain heights, yet wars, plagues, and the ravages of time have dimmed its glory to a faint ember kept by a tiny order of faithful monks. When sinister forces stalk the night and even those faithful few begin to disappear, the church sends out a call for heroes to investigate and save this remnant of a wiser and more learned age. Yet all is not as it seems among the high peaks, and secrets grow darker and danger ever deeper with the moon’s every rising.
When Comes the Moon is a Pathfinder Second Edition adventure for 8th-level characters set in Yolbiac Vale, in the Lost Lands Campaign Setting.