A virus swept across the Earth, as a result of which a large part of the population turned into bloodthirsty and cruel madmen, or in other words, “infected.” Civilization plunges into chaos, humanity is on the verge of extinction. True, some people have a special gift – to understand the speech of the infected and talk to them. One of the few who has this ability is Dr. Morgan. His wife is also infected. Morgan decides to find a so-called Zero patient, with which you can create an antivirus and save humanity.