Terrorists have set off a massive explosion in a federal building, releasing toxic gases that spread through the ventilation system. Their goal: to expose the government's secret biological weapon, a deadly virus. It instantly attacks the adrenal system, giving those who breathe in the toxic gas superhuman abilities, but they are no longer human because the gas makes them lose their minds and become tools of killing. The virus spreads throughout the federal building, and employees become bloodthirsty and aggressive. A group of uninfected employees must band together to fight for their lives. The infected are rapidly threatening the entire building, and are about to reveal a political conspiracy.