From the back of the book:
Stay Out of the Woods
Deep in the forest, something is stirring. An evil fey sorcerer, cast out of the First World millennia ago by her own kin, has found a way to break through the ancient walls of her prison, and carries with her a vengeance too deep to be sated. For the quiet Andoren town of Bellis, busy celebrating a long-awaited marriage, it's a time for joy and laughter. Yet the forest that's always sheltered it is growing dark, and things are moving in the heart of the woods...
Realm of the Fellnight Queen is a wilderness adventure for 7th-level chararacters, written for the Pathfinder Roleplaying Game and compatible with the 3.5 edition of the world's oldest RPG. Inside you'll find a possessed druid, a drunken treant, an insane beekeeper, shape-changing forest warriors, and the dark mistress of the Fellnight Realm herself.
This module is the result of Paizo Publishing's RPG Superstar contest, which allows unpublished authors to compete before a panel of celebrity game designers and legions of their peers for the chance to write a Pathfinder module.