Twilight. With zombies. Eighteen-year-old Katie Allred is socially awkward and unpopular at school. The only child of parents who had her right out of high school, Katie is herself about to leave the nest, even though she hardly feels ready. Katie’s new after-school job at the Zimble Box Corporation draws her into the complex social strata of high school cliques and backstabbing friends in ways she never imagined. Katie soon discovers there’s something very strange about the “in” crowd at school—and about her employer, too. Shortly after starting her new job, the Contagion breaks out, plunging her town and the…