Long after a virus rages across the United States turning humans into flesh-eating monsters, Sanna Larson is eager to follow in her warrior father's footsteps and defend her rural, isolated community on the wintry banks of Lake Superior.

When a failed hunt leads a new and dangerous enemy to target Sanna and her village, she begins to doubt her sanity and future.

As the death toll rises, a mysterious stranger arrives with keys to unraveling Sanna's secret origins. Desperate to save her village, they undertake a perilous journey through the monster-infested wastelands and discover that sometimes the most terrifying monsters are the ones buried deep within.