You worked as an ordinary doctor in a polyclinic. But after a series of mysterious accidents at nuclear plants, there was practically nothing left Alive on earth, and the world began to be filled with creatures unprecedented to man, which were mutating people and animals. People were forced to live underground and not go out unnecessarily. It would seem that this tragedy will unite people, but it did not happen, people also divided into camps. You were a pretty good medic and you didn't have connections to any of these camps.