James and Lily live off the grid, raising their young daughter in a cocoon of comfort and self-sustainability. When a mysterious mass SMS ripples its way across the country triggering a crippling, apocalyptic cyber-attack, their home transitions from sheltered oasis to a fortress. Estranged friends soon show up at their door for protection and community. But the unexpected reunion is quickly undermined by the ghosts of the past, the spark of lingering romances and the threat of a violent local militia. The friends struggle to survive as the world crumbles around them - but will they be able to survive each other?