The signing of an important treaty between the US and the IRK is about to take place at the UN. Kamistani terrorists, resentful of America and disappointed at Hassan's willingness to concede their attempts at developing nuclear weapons, choose this day to attempt to assassinate the Kamistani president, Omar Hassan. The assassination attempt is initially led by Hassan's brother Farhad.
CTU learns from the rescue of Hassan that terrorists have a plan to acquire nuclear rods from the Russian mob. With the help of Renee Walker, Jack forces the cooperation of Sergei Bazhaev's mob family. The nuclear rods are given to Samir Mehran, who plans to make a dirty bomb on American soil. Hassan's head of security, Tarin Faroush is revealed to be a part of Mehran's group and they present an ultimatum to Taylor's government - she must hand over Hassan for execution or the bomb will be detonated.
When Taylor orders that Hassan still be protected at all costs, a black-ops team attempts to kidnap him. Jack Bauer and the rest of Hassan's protective detail kill all but one member of the team but upon learning of the ultimatum, Hassan turns himself in to Mehran. With the nuclear crisis averted, CTU agents attempt to save Hassan and close in on Mehran. However, they arrive to see that Hassan has already been killed. Taylor is able to resurrect the treaty by convincing Hassan's wife Dalia to sign the treaty on her country's behalf.