In a secure government building, a mysterious explosion releases a deadly virus that causes widespread panic and chaos. The virus transforms those exposed into violent, bloodthirsty killers, creating an immediate and dire threat. As the quarantine perimeter is established, a group of survivors, including employees and security personnel, find themselves trapped inside with the infected. Amid the fear and confusion, they must navigate the labyrinthine facility while trying to understand the nature of the virus and seeking a way to escape unharmed.

Cut off from outside help and with time running out, tensions rise among the survivors as they face life-threatening encounters with infected individuals. They form uneasy alliances and confront ethical dilemmas in their struggle for survival. Pursued relentlessly by the infected, they uncover pieces of a larger conspiracy that led to the virus's release. With every moment critical, the pressure mounts as they attempt to outwit both the infected and any hidden conspirators, leading them to a climactic series of decisions that will determine their fate.