Open Cell hackers form a plan to get Jack inside the U.S. Embassy and recover Tanner's flight key, to prove that the drone was hijacked. When the plan fails, Jack is forced to shoot into the crowd and start a riot to gain entry to the building, with Agent Morgan close behind.
Audrey Boudreau is now married, and her husband, Mark, promises she'll never hear Jack's name again. 1st Lieutenant Chris Tanner's drone is hijacked and attacks a friendly convoy before he can do anything about it.
Margot Al-Harazi asks her daughter Simone if she wants her husband spared, but ends up killing him for his betrayal. Then, she posts a video on the Internet demanding the surrender of President James Heller for killing her husband, threatening the English if he doesn't.
Margot Al-Harazi threatens London if the President of the U.S. doesn't give himself up. Naveed's sister leaves a voice mail on his phone, which Margot discovers in his dead body, saying she was planning on leaving London.
Simone Al-Harazi answers she knew nothing about Naveed's plan to escape. Margot doesn't accept this and orders Simone to kill Naveed's sister. During a struggle, Farah's daughter, Yasmin, runs away and Simone is hit by a bus trying to catch her.
CIA Head of Station Steve Navarro tells Jordan to hold off, then calls someone about Reed's snooping; his contact warns him about the consequences. Jack Bauer has a plan to bring a contact of Al-Harazi's out to help them. PresidentJames Heller authorizes this plan and relays it to the Prime Minister of the United Kingdom, whereupon an advisor tells him the President may not be in top medical condition, and takes the matter into his own hands, with MI-5. Jack's plan to trick his contact into helping is interrupted by MI-5. During the firefight, he finishes the operation himself and Chloe gets a phone number: that of Simone's, who runs into traffic and gets hit by a bus.
Simone tells Farah to flee London, but kills her. She chases after Farah's daughter, Yasmin, but is hit by a bus. At the hospital Jack questions Simone Al-Harazi about her mother's whereabouts, but they are forced to flee the hospital because of an incoming drone. The drone then destroys the hospital.
CIA Head of Station Steve Navarro is told by Adrian Cross that Jordan Reed is retrieving the files that incriminate him. Navarro then assigns Reed on a "field mission", but is shot in the shoulder. He survives and flees.
Chief of Staff Mark Boudreau meets up with Anatol, who demands that Jack should turn himself over to the Russian government and that forging the President's name would be treasonous, but Mark states that once the threat is over, everyone will have what they want.
A drone fires a missile and destroys St. Edward's Hospital and Margot tells President Heller that he will surrender himself and she will destroy the drones. Jack Bauer insists to President Heller that there must be another way, but President Heller convinces him that this is the best way to go.
Audrey Boudreau asks Chief of Staff Mark Boudreau if it's too late, to which he responds that it is. Audrey scolds that she'll never trust him again, but Mark defends himself, saying that it was President Heller's order and that he'll do it again.
Margot Al-Harazi orders President Heller to be at the center of Wembley Stadium in one hour. As President Heller awaits his execution, Margot flies the drone and fires a missile, destroying the center of the field. Margot sees that the target has been destroyed.
Jack tells Chloe O'Brian that the override device has been recovered and needs her to analyze it. Chloe answers that she can’t now that Margot Al-Harazi is dead and the threat has passed. Chloe meets with Adrian Cross, who thanks her for another chance. Agent Kate Morgan learns that her husband has been passing classified material to the Chinese.
Kate informs CIA Head of Station Steve Navarro that Jordan’s body has been discovered along with another man. Navarro calls Cross and tells him that he needs safe passage out of the country now that the CIA is on to him. Cross agrees in exchange for the override device.
The CIA informs Jack Bauer the assassin’s identity and learns that he was associated with Navarro. As Jack learns this, Navarro vanishes with the override. Navarro escapes the CIA with Jack in pursuit.
Jack Bauer tells Ritter they need to move quickly before Cross moves. He gives instructions to his team, and to Ritter. Mark Boudreau, accuses his wife, Audrey Boudreau, of harboring feelings for Jack Bauer. She walks out of the room, and he calls Anatol about claiming Bauer.
Chloe O'Brian is horrified to learn that Adrian Cross was working with Cheng Zhi, who acquires the override device from the two. Cheng kills Adrian and uses the override to order the USS Massachusetts to fire a Chinese carrier—the Shenyang. PresidentJames Heller informs Chinese President Wei that Cheng Zhi was responsible for the attack, but President Wei insists that Cheng is dead and that an attack on a Chinese carrier will not go unanswered for. President Heller pressures Jack to find and stop Cheng before the Chinese retaliate.
Cheng Zhi tells Anatol Stolnavich that Jack was supposed to be eliminated and Jack won't stop until he finds Cheng. Stolnavich assures Cheng that in an hour, he'll leave on a cargo ship to escape the country. Chloe escapes Cheng's custody by jumping out of the van and rolls down a hill.
Jack demands to know why Chief of StaffMark Boudreau set him up for the Russians. Boudreau confesses that he thought Jack was going to assassinate President Heller and forged Heller's name on the document that sanctioned them to hand Jack over to the Russians. Angered, President Heller places Boudreau under arrest for treason. Jack decides to use him to set a meeting with Stolnavich. Stolnavich discovers Boudreau's intentions and tries to kill him. Stolnavich tells Jack that Russia hasn't forgotten what he did and he'll pay for it before dying from the assault.
Audrey Boudreau tells her father that she can meet up with Jiao Sim from the Chinese Embassy in London to hand evidence about the override device being used to convince the Chinese that the USS Massachusetts wasn't being ordered by the US government. Audrey hands the evidence over to Jiao, who is suddenly shot by a sniper, who also kills the Secret Service agents who escorted Audrey. Audrey then receives a call from Cheng, who tells her to sit back down on the bench or one of his associates will kill her.