Here ya go-
The episode began with the phone call from their father. (who is somewhere around sacramento now). Sam wants to go get him, but Dean insists on following orders and they head down to indiana, to a stretch of road where different couples had vanished during the same weekend, every year for a few years now. Sam freaks out about finding his father, and leaves Dean. Dean heads to town to ask around about the missing couple from the year before, but nobody knows them. Sam then meets up with some hitch-hiker girl on the road, but she leaves him pretty quickly. While Dean is driving around, his little ghost meter thingy goes off. He climbs out of his car and walks out into the orchard, and finds an old scarecrow (it is freaky looking). Dean then finds out there is another couple in town (their car broke down), and he goes to talk to them, but the local sheriff gets mad at him. Sam meets up with the hitch-hiker girl at a bus station, and the two brothers end up calling each other. The girl leaves town. Sam goes to some university to investigate some local legends, and finds out about a thing called the Vaner (sp?). Every year, you must sacrifice a male and female to it, and it keeps crops and stuff alive. But when Dean leaves, the Sheriff knocks him out. Dean and a local girl end up in the forest to become sacrifices, and Sam comes to save the day. They burn down the old tree that is connected to the scarecrow. At the end we find the hitch-hiker girl is actually something evil working AGAINST the brothers.
Okay, there it is. There's a bunch of stuff I'm sure I missed. But don't forget that it comes on again Sunday after Charmed. (I think) I don't know how to spoiler tag, so I hope making the words white works.