On his new job for the Department of Defence...Jack goes to a meeting at the CTU just after a train bombing, and becomes embroiled in efforts to thwart a second attack rumoured to be planned by Turkish terrorists.
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Jack follows the terrorists who kidnapped Andrew, but is reluctant to intervene, even when Andrew’s life is in danger; Chloe continues to help Jack behind the scenes, even though she’s appalled that he’s putting Andrew’s life at risk; and Driscoll hires an ex-girlfriend of Curtis’, who bears a grudge against him.
Kalil figures out someone is following him, and takes the ultimate evasive action; Heller and Audrey attempt suicide to escape Heller’s trial by the terrorists; and Debbie’s mother goes to the Araz house looking for her daughter.
Jack and Audrey are attacked by thugs who were tipped off about their trip to a security company; Edgar executes a risky computer hack to try to take the vulnerable power plants offline; and Navi finds out Behrooz is still alive when Behrooz contacts Dina and she goes to meet him at a train station.
After Jack rescues Behrooz, Dina leads Jack to the office where the terrorists planned their attacks; Curtis takes Marianne to recover some files from Powell’s office; Audrey learns her husband has a connection to the terrorists; and Driscoll reinstates both Sarah and Tony to active duty with the CTU.
When the CTU agents learn Marwan has the override device at an office building, Jack joins Curtis there as the clock ticks toward meltdown for the remaining nuclear plants; and Driscoll deals with her daughter’s crisis at the CTU clinic.
Jack and Paul confront a team of McLennan-Forster commandos, using a sporting goods store as a bunker; Tony and Michelle struggle to work together again; and Marwan starts to execute the next phase of his plans.
After President Logan botches a mission to capture Marwan by ordering Jack’s arrest during the mission, he calls in an advisor with more experience; and Chloe follows a tip that may lead to Marwan’s collaborators.
With Palmer’s permission, Jack kidnaps a Chinese national who may be the only lead to Marwan; Chloe struggles with her emotions after killing her assailant; and Audrey is horrified when Jack deliberately jeopardizes Paul’s life during emergency surgery.
Chinese consulate security head Cheng Zhi realizes Jack and the CTU conducted the raid that resulted in the Consul’s death; Palmer and Buchanan do all they can to stymie Cheng’s inquiry; Jack learns where Marwan is and rushes to capture him; and Marwan prepares to launch the stolen warhead.
As the warhead races to an unknown destination, Marwan escapes from CTU custody; the CTU figures out Richard Heller was the link Marwan used to plan Secretary Heller’s kidnapping; and the Speaker of the House becomes suspicious of Logan’s reliance on Palmer.