What happens when you get abandoned in a quarantine zone full of people infected with a dangerous disease? Pierce's team encounters an unlikely threat. The challenges ahead of them will test their physical and mental limits. James and his group find out that the cathedral they considered sanctuary is not so safe after all. Daniel makes a discovery that has him questioning everything he's known his entire life. As the days go by, Krista loses hope that her husband will ever come back. Heather and her sister are still alive, but the infected are making it difficult to find a way out. With every minute they spend in the city, their likelihood of survival dwindles. More and more, there's word of a "purge" of the city being prepared by the military. Can the survivors make it out before it's too late?