Forty-eight hours after the Upheaval, reality is beginning to set in at the Whitaker Estate. The world, As We Know It, has ended. Dillon Mitchell and her friends are left to survive, after discovering most of the population, at least in the United States, has mysteriously died. While they struggle to come to terms with their devastating losses, they are faced with the challenge of creating a new society, which is threatened by the divergent factions that may tear the community apart from the inside. Even if the group can unite, external forces are gathering that could destroy their fragile existence. Meanwhile, Dillon's budding relationship with the elusive Skylar Lange faces obstacles, when Skylar's hidden past is revealed.