301 days have passed since Ray (Alexander Skarsgård –True Blood), Claire (Andrea Riseborough – Birdman, Oblivion), and their daughter, Zoe (Emily Alyn Lind –The Haunting in Connecticut 2: Ghosts of Georgia, Revenge) found refuge underground. With nothing to distract them from their own fear, they hold onto hope for a normal family life above the surface someday. What looms above the cement prison they call home? The one thing they know for certain is that there is something terrifying and strange that threatens their fragile existence, and it is coming for them.