Sixteen-year-old Kaelyn challenges her fears, finds a second chance at love, and fights to keep her family and friends safe as a deadly new virus devastates her island community.

Katelyn and her friends race to deliver a vaccine for a virus ravaging the population to the Centers for Disease Control in Atlanta, but the Wardens, a lethal band of survivors, are hot on their trail, and Katelyn is forced to compromise her morals to keep her group alive.