I'm working on a MotW mystery set in a village that has a contract with a forest spirit they worship as their god. In exchange for either 5% of the town's harvest or a human sacrifice (the villagers choose each year), the spirit keeps the village safe from dangerous monsters that roam the woods and ensures the success of the village's crops and livestock. Most of the village is happy with the arrangement. There are a few who are against it as they've seen no evidence of dangerous monsters in the woods in their lifetimes and caring for the soil keeps crops and livestock healthy.
When a late season blight begins spreading through the fields, livestock is brutally slaughtered by unnatural beasts, and villagers begin disappearing from nighttime walks, the voices of those opposed to the arrangement get louder and it's up to the hunters to figure out what exactly is going on and put a stop to it before the village has no food to survive the winter.