After surviving a car accident, Michelle (Mary Elizabeth Winstead)
wakes up to find herself in an underground bunker with two men. Howard
(John Goodman) tells her that a massive chemical attack has rendered the
air unbreathable, and their only hope of survival is to remain inside.
Despite the comforts of home, Howard's controlling
and menacing nature makes Michelle want to escape. After taking matters
into her own hands, the young woman finally discovers the truth about
the outside world.
