It's November 2020 and the world is freezing over. As ice water melts into the Atlantic, and vast swathes of people make for the warmer south, Dylan is heading to Scotland, once the home of his late mother and grandmother.

Twelve-year-old Stella and her survivalist mother, Constance, scrape by in the snowy Highlands, preparing for a record-breaking winter. Living out of a caravan, they spend their days digging through landfills, searching for anything of value. When Dylan arrives in the middle of the night, their lives change course. Though the weather worsens, his presence brings a new light to daily life, and when the ultimate disaster finally strikes, they'll all be ready.