It's been three years since the world went dark. Matt Blaine and his family, as well as their fellow townsfolk, have gotten on with their lives as best as they could under the circumstances. Then the unthinkable happens: the town is attacked by two antagonists, one viral, one human. It will take everything Matt and his family have, with the help of some newcomers, to overcome and survive, while trying to save their town at the same time.