From the description:
Darkness Beyond Hollowridge is an adventure module for the world's most popular roleplaying game. This adventure should span several sessions of play for 4 characters of 6th level. The civilized areas of a deep woodland fight against a corrupting force. Insert this adventure into another campaign world or use it to run a short campaign.
Overview
The Marsdon Woodland is host to a new cult that works to bring their deity of darkness to power. The cult’s work causes havoc across the forest and within the city of Hollowridge. The characters contend with the cult and its hirelings and goons. Characters will travel from ragtag bandit camps to dangerous caverns that transform around them. Within the heart of the cult’s base, they will fight in the darkness of the deity’s realm to stop the ritual.