Forest ranger Finn Wheeler is assigned to cover Beaverfield, a small town where the residents are divided over a pipeline proposed by businessman Sam Parker. Upon arriving, Finn befriends mail carrier Cecily Moore while meeting the various residents. That night, a blizzard knocks out all power in Beaverfield, forcing the residents to take refuge in an lodge owned by Jeanine Sherman. The power outage occurs right before resident Trish Anderson’s dog is killed by an unknown assailant, which increases tensions in the town. Further conflict arises when Finn discovers that all of Beaverfield’s generators were sabotaged and the body of Jeanine’s missing husband Dave is underneath the lodge’s porch.
The residents attempt to barricade themselves in the lodge for safety, but Trisha’s husband Pete has his hand bitten off by the same unknown assailant. Environmentalist Dr. Jane Ellis, an opponent of the pipeline, concludes that the assailant is a werewolf who is one of the lodge’s current inhabitants. After announcing her findings, Dr. Ellis dies in front of Parker under ambiguous circumstances; Parker claims she committed suicide.