Contains spoilers for this episode and earlier episodes.
Kate spots Marie among the people detained at Norton Airfield and follows her outside. Marie draws a gun on her sister, but Jack arrives and shoots her in the arm. During questioning, Marie claims that the bomb is being driven downtown. Her description of its timer gives Jack reason to distrust the story, and he orders a search of the airfield instead. The real nuclear device is finally located before the hour ends.
George Mason can no longer conceal the effects of radiation poisoning. After collapsing at CTU, he hands his access codes and command responsibilities to Tony Almeida. Mason leaves quietly rather than make his colleagues stop work to say goodbye. Carrie Turner arrives to replace Paula, bringing an awkward history with Michelle into the office. Tony takes over while the staff are still searching for a weapon whose detonation time is approaching.
Palmer questions Sherry about Stanton's accusation that she helped undermine his administration. She says she cultivated Stanton to protect David, and a CIA contact supports her account, but Palmer still orders her out. In Lonnie's bunker, Kim wants news of her father. Lonnie secretly disconnects his radio antenna and claims the blast has damaged reception. Kim then finds a working television showing ordinary Los Angeles broadcasts, exposing the lie that brought her into the shelter. She forces Lonnie to let her leave.