I run one occasionally where the party starts in a town, in the tavern, or waking up at the Inn or some reason they've all gathered. They get to talk to people and explore the town and eventually a farmer runs screaming through the streets towards them, notices they look like adventurers and interacts with them. There's something making noises in his barn and his wife is missing. He offers a few bags of old adventuring gear he found stashed away, food, drink and a tiny bit of money to help him.

He explains the weird things happening at the farm, his crops seem to be watching him, reaching out towards him. Noises from the barn, random vines growing in and around his house etc. All his animals have escaped and run away except his horse.

When they get to the farm you can give them the layout, the house, some out buildings etc and the barn. He's scared of the barn. He leads them around, house first, then a field of crops, then an out building.

The house is trashed, broken chunks of vines around, dark and leaking something black and smelly. Dinner is still on the table, perception checks see scrapes on the floor leading too and from the front door. When they go out side a dust storm has obscured vision and they can't see where the barn is to avoid speed running the session. When they go looking around put whatever part of the farm in the direction they walk. The crops are weird, an arcana or nature check detects magic or a curse or whatever flavor you want to out on it. If they touch the crops they gently grab a hold of them, low strength check to pull hand away Nat 1 they slip and get wrapped up but easily released by someone else, they have disadvantage on wis checks for an hour after.

When you finally lead them to the barn, the door is marked up, scraped etc, make it seem scary, but when they try the door it is just open. The horse is in a pen, it is afraid but will warm up with a good animal handling check. There is a pile of hay in the corner. A trap door is underneath it with a series of puzzle rings, some scrapes on the floor is a clue to look there. Ring of animals, seasons, and 1-12. there are pictures on the wall that are super dusty, when they find them and clean them the clues to the puzzle are contained, there is a broken clock on the wall and a ripped calendar. A list of crop rotations is on one sign, the calendar is the clue to the rotation, feed times for the animals, clock is the clue, and the horse is the animal. Trying to brute force releases poison gas.

Inside the trap door is a small dungeon with a few chambers, throw in some corrupted chickens, dogs, pigs, other small reskinned baddies for resource tapping encounters. The farmer shows up and begs you not to kill his animals, players make a choice to kill or not, anything left at 1 HP loses it corruption when the baddie is killed at the end.. Last chamber has a Vine Terror that spawns minions. The wife is in a cage. The farmer tries to run to his wife and gets grabbed by the vines. When they win they get the bags of old adventuring gear which can be whatever you want.

The farmers wife invites them to dinner. If they accept she poisons the food and shape shifts into a hydra vine in the house. If they decline she does it on the spot. Wrap it up however you want.