On Christmas Eve, a sudden global cold wave traps cities in ice. Hilda prepares to travel to her ancestral home with her family, but her 'sister' Erica insists on taking the bus due to exhaustion. Hilda's fiancé, Paul, unexpectedly supports Erica instead of her, revealing his betrayal. As Hilda faces rejection from her family, three mysterious men appear, warning her that a blizzard will block the highways in two hours and the car will be stranded for days. They reveal a looming apocalypse, forcing Hilda to confront this urgent threat with no clear escape.