Party girl Samantha Sanders is celebrating her thirtieth birthday in style—a road trip to Las Vegas for a long weekend with her girlfriends. Staying in the swankiest hotel on the strip, she’s naked and in bed with the sexiest guy she’s ever laid eyes on when the clock strikes twelve. Who knew the world would really end December 21, 2012? Those Mayans, they weren’t lyin’…

Russ Weaver is above all else a soldier. Looking for a little fun before spending Christmas with his crazy family, a weekend on leave in Vegas unexpectedly turns into his newest mission——protecting the sweet, scared woman he happens to be in bed with when the world as they know it is over.

Wandering throughout the virtually abandoned streets of Vegas, the fine city has turned into a war zone. Their only hope to get out alive is to stick together—and fight those who wish to cease their endeavors. Permanently.