Dauphin Island, Alabama is an idyllic Gulf Coast paradise, or at least it was before the lights went out. When an unknown Event causes the power, along with the cars and electronics, to stop working, Emily must undertake a bicycle journey with her children from the city of Mobile to reach Andrew, a police chief who is struggling to maintain order on their island haven. Chaos and trials will plague them both, but as they come together, they continue to face trouble, in the form of suicides, marauders, rioting and political conspiracy. Just when they think they've managed to pull their isolated community through the worst of the Event's aftermath, a hurricane approaches, putting them in the crosshairs of something so destructive, the Island's very survival is at stake.