In the fallout from the attack, links are made to a Russian cell, and an irrevocably changed Renee resurfaces. Then, Hassan's betrayer meets with his allies.
Jack makes a breakthrough by closing in on a significant individual. Meanwhile, a meeting between President Taylor and Hassan yields surprising results.
The nation remains vulnerable, but President Taylor presses on with the peace process. Then, as CTU faces failure, the search begins for someone to blame.
President Taylor pressurises CTU and Jack's plan has operatives panicked. Meanwhile, as the looming threat intensifies, events take a turn for the worse.
CTU apprehends a suspect in the thickening assassination plot, but Chloe's convinced they've got the wrong person. Meanwhile, Dana's past returns to haunt her.