Losses pile up like the snowdrifts of a never-ending winter in this post-apocalyptic series conclusion.

Nathan Tolley’s wife is gone, leaving him adrift in a vast ocean of bitter white that promises nothing but heartache and despair. Yet, his weary band of travelers continue to look to him to secure their safety. But Nate’s no leader. Every decision he’s made on their dangerous cross-country journey has taken them from bad to worse. First Detroit. Then Chicago. Now, Wyoming, which proves the deadliest of all.

As circumstances continue to deteriorate like the weather, Nate turns their sights south, but the past is about to catch up to them in ways none of them will see coming. And in order to embrace an uncertain future, sacrifices must be made.

Survival of the fittest gets real—fast.

And, this time, it’s personal.