Day 4: 12:00 p.m.-1:00 p.m.

Plot:

Jack initiates a fierce gun battle with the terrorists as he races to rescue Audrey and Secretary Heller before the military strikes. Dina is shocked to learn that Navi and Marwan plan to have Behrooz killed. Secretary Heller learns his son is a suspect and allows the interrogation to continue. Curtis Manning learns that the briefcase stolen from the train bombing contains a Dobson Override that could potentially give terrorists control of America's 104 nuclear plants.