A deadly strain of H5N1 (avian influenza, or bird flu) spreads throughout the urban population,
at an outbreak rate of 2,000 new cases each hour, and death occurring within 36 hours of
infection. As the virus spreads, those who are infected get quarantined in an abandoned city.
As the people struggle to survive within those walls, a firefighter and a doctor race against time
to find a cure.