The Stand - Stephen King

And here is the bleak new world of the day after: a world stripped of its institutions and emptied of 99 percent of its people. A world in which a handful of panicky survivors choose sides -- or are chosen. A world in which good rides on the frail shoulders of the 108-year-old Mother Abagail -- and the worst nightmares of evil are embodied in a man with a lethal smile and unspeakable powers: Randall Flagg, the dark man.