School is let out early because of a massive blizzard. Everyone is supposed to get home before the weather gets worse. But Scotty Weems and his friends decide to stay after for a couple hours to work on a shop project, figuring that one of their parents will be able to pick them up on the way home from work. This turns out to be a really bad (and really deadly) decision. Along with several other students and one teacher, they are trapped in the school by the snow. And it keeps coming. And coming.
It doesn’t take long before this becomes a survival story.