In 2016 a catastrophic virus unlike anything the world had ever seen ripped through the human population on a global scale. Over the course of three months, seven billion people were infected and devolved into thoughtless, rabid predators, their only instinct to attack and spread the pathogen. Military crumbled, government collapsed and within four months all of civilization had fallen into oblivion. Two years later, the human race is an endangered species, teetering on the precipice of extinction but Harley has the key to end the plague and John is just the man to convince her to use it.