It was slowly approaching. In the city, no one noticed how empty the streets were in the off-season. No one thought twice when people called in sick. And then, while at work, John and his co-worker, Callie, noticed an unusual fog surrounding their office. Cell phone service was cut off. Phone lines went dead. Almost immediately, they lost contact with the outside world. When they went out to investigate, the fog burned their exposed skin and made them sick. Finding themselves in a difficult situation, they must figure out what is going on and how they can be saved.