After a catastrophic car crash, a young woman (Mary Elizabeth Winstead, Scott Pilgrim vs. The World) wakes up in a survivalist's (John Goodman, Argo) underground bunker. He claims to have saved her from an apocalyptic attack that has left the outside world uninhabitable. His theories are supported by a mysterious stranger who is in the bunker with them (John Gallagher Jr., "The Newsroom"), but as his increasingly suspicious actions lead her to question his motives, she'll have to escape in order to discover the truth.