Dan Trachtenberg directs this thriller starring Mary Elizabeth Winstead as a young woman who is involved in a car crash. When she comes to, she finds herself a captive in the cellar of a man named Howard (John Goodman), but he assures her he has saved her from the outside world which is no longer safe due to a chemical attack now making it uninhabitable. She begins to question his story, and decides that she must see the outside world for herself. The cast also includes John Gallagher Jr. and Suzanne Cryer.