In a calamitous future, runaway climate change has made the planet nearly uninhabitable. Civilization has collapsed, and every day is a struggle. Lucy, a young mother of two, dreams of a better life by bringing back vanished knowledge. But the rest of her group is focused only on day-to-day survival-at any price. When a deadly hurricane destroys their home, Lucy's group is forced on the road, where they must cope with hunger, searing temperatures, and vicious rivals. And their nightmare is just beginning...