"Suggested for mature readers" -- page [4] of cover.

"What happens when the whole world literally changes overnight? Stuck in a dead-end job, tormented by a tyrannical boss and an annoyingly materialistic girlfriend, Sam rises from another night of aimless bar-hopping to discover his whole world has changed-- and for the worse. An avian flu outbreak has killed millions, the nation's infrastructure has crashed, and a dirty bomb has destroyed Seattle. But when he wakes the next day, Sam finds himself back in his 'normal' world-- and back in chaos the day after that. In one world, anything goes. In another, he's out of danger, but sleepwalking through his life. So now Sam has an even bigger problem: which one to choose?" -- p. [4] of cover.