They are joined by two other survivors, Gus and Emilie. Infected, Zoe must also face the realization that she has developed a telepathic link to the living dead that fills her mind with darkness and evil. Facing unimaginable horrors and unthinkable tragedies, the group must fight both the living and the dead. Zoe and Boggs manage to fall in love while surrounded by death and despair. Before long, it becomes clear that the living dead do not play by usual zombie rules.