When their sorority reunion is interrupted by an outbreak of a terrifying illness known as “The Morbs,” three former best friends take shelter in a cabin deep in the snowy woods of New Hampshire. Forced into close quarters after five years apart, the women rekindle old connections and conflicts as they discover the new people they’ve become. But the snow is falling fast and “The Morbs” is lurking just outside the cabin’s door. When it comes knocking, will the friendship that once held them together be enough to get them through the night?