Seventeen-year-old Sarah lives on the 16th floor of one of the skyscrapers. Sarah and her family became quarantined along with other residents. Shield from the thick fog that masks the ground below. Unaware of what is really going on outside. The residents are about to discover things are far worse than they expected. Marley is caught in the chaos below the fog, trying to survive with her younger sister Maddie, her boyfriend Ted, and her mother in a hospital, trying to make it to safety before time is up. The quarantine zone is their only chance of surviving. Will they make it in time before time runs out? And they become trapped outside.