Protagonist Kyle Crane learns from a survivor that cultist groups living outside the infected-filled quarantined city of Harran have successfully controlled the virus. With the Tower running short on Antizin and Camden’s efforts to produce a cure still unsuccessful, Crane decides to go investigate this supposed immunity. He heads out to the countryside, where he discovers that many of the survivors out there have converted to a religious cult called the Children of the Sun, who worship the Mother which is apparently the source of their immunity to the virus. In order to earn the cult’s trust and learn more about the immunity, Crane decides to assist the survivors. Eventually, one of the Faceless, the high-ranking members of the cult, approaches Crane and privately admits that their immunity is gained through a special elixir they had discovered, but like Antizin, it only suppresses the infection and does not fully cure it. The Faceless also reveal that they are working on a permanent cure, and promise that in exchange for his help, they will give Crane the cure to take back to Harran.