Wolf Medicine by Monique McMorgan

Just as Dominic is about to propose to Patrice, Timber Creek is caught in the biggest snowstorm the town has seen in decades. When the town mysteriously loses power, it becomes clear that storm has brought with it a frightful new guest. The town gathers in the High School - a makeshift crisis center - and when a missing worker from the power plant wanders in from the storm, it becomes clear that something is sinister is afoot.