Callie is missing.Her brother Kai is losing hope of ever seeing her again. Then he meets Shay, a girl who saw Callie the day she disappeared, and his hope is reignited.Their search leads them to the heart of a terrifying epidemic that is raging through the country. Can Kai and Shay escape death and find Callie? Contagion is the brand new thriller from the author of the international sensation Slated.