It's been less than a month since the most catastrophic pandemic in recorded history decimated the world's population. Survivors are beginning to pick up the pieces of their lives while navigating their horrific new world. The infected are still roaming the streets, ripping apart those unlucky enough to cross their paths, but something has changed. They are not dying as quickly as they had when the virus was first released. In an Us versus Them world, survivors swiftly learn that it is not the infected or even the virus they should fear the most, but those most like themselves. Tess and Henry have picked up a passenger with a dangerous secret while, less than a mile away, Bunmi resolves to do all she can to create a vaccine.