Sophia is given one last chance when she wakes up three days before the apocalypse and is reunited with her biological parents. They speak of a high-tech mountain haven built to save her from the Freeze, but the truth is far crueler: the shelter was designed as a prison so they could lock her away and seize her inheritance. Instead of becoming their victim, Sophia claims the advantage. When the world is swallowed by a brutal ice age, she takes control of the trap and turns it into her own safe haven, watching her family shiver outside as they beg for help.