Sara is an 18-year-old girl from a middle-class family, while Ivan is a middle-aged volunteer. They are locked together in a shelter during quarantine, while outside the outbreak of a virus that turns people into vicious and irrational beasts. Apparently in the safest place on earth, soon they will face an even worse danger: the girl is infected and she is slowly changing. What to do? Kill her? Save her? And how to survive without a chance to escape?