10 years ago, the world ended. A plague, called the RedRiver Plague, wiped out nearly 80% of all primates on Earth, humans included. The plague was swift and brutal. Those who came crawling out of the ashes of the ruined world soon fell victim to each other, with survivor camps devolving into war parties that killed and pillaged rival groups. A decade later, humanity hangs on the brink of extinction. You are alone, or so you thought. Richter has been stalking, and he just caught up.