A kind of plague has spread across the Earth, which either kills people or turns them into incomprehensible and bloodthirsty creatures capable of imitating human behavior and speech. The survivors hid in secluded dwellings in hard-to-reach places such as dense forests and mountains. Meanwhile, a company of 2 people lives in the wilderness and strictly follows the rules of survival and keeps records of observations of these creatures. One night, someone or something comes to their house and asks for help...