The last thing on Joan Walker's mind is the Apocalypse. She always figured that was just some bible thing that would never happen, and if it did, it would be years in the future. Then her neighbor, Everleigh, is chosen to be a prophetess. And her first piece of revelation? The Apocalypse is coming, and soon. A fanatic is breaking the 66 Seals that keep Lucifer locked up; the Four Horsemen of the Apocalypse have already been released. Following the promptings of the archangel Gabriel, the two girls hit the road in an attempt to stop the Apocalypse.