Veteran park ranger Alexander Doyle is tracking a nuisance bear when he runs across obnoxious environmentalist Martin Ramirez. He and Martin have clashed before, when Martin and the protestors under his leadership ended a plan to expand the network of paved trails and improve accessibility. Given a choice, Alex would rather face the bear. When the dangerous grizzly attacks them and Martin is gravely wounded, his only chance of survival is Alex's determination to keep him alive through the night. But they're stranded miles from any hope of rescue with the year's first snowstorm coming in fast.