Like an assassin in the night, the virus struck without warning. Rendered mindless, and with a lust for blood, those infected stalk the streets, unleashing a wave of violence and death upon the city. When the government's effort to contain the deadly outbreak begins to fail, involuntary quarantine is imposed. As the Department of Special Disease loses complete control of the situation, private military contractor, Eric Mann, leads a team into the epicentre of the catastrophe to rescue the few civilians who remain. But not all is as it seems, and with betrayal at the heart of the disease, Eric battles to keep himself and the others alive.