When a woman vanishes from a long-distance bus during a blinding snowstorm, the vehicle is stranded miles from the nearest town with no signal, no way out, and no explanation for where she went. As the cold closes in, two strangers among the passengers begin to realize that everyone on board is hiding something — a lie, a past, a reason to be on this bus at all. What starts as a search for one missing woman becomes a slow unraveling of secrets that someone on board would kill to protect.