Jack is in pursuit of Navarro, who is on the run after stealing the override device. Kate and Ritter are leaving the crime scene where they found Jordan when Kate gets a call from Jack about the situation with Navarro. Kate and Ritter hurry back to the station while Jack continues to track the disgraced CIA station head.
Navarro gets a hold of Adrian to secure his safe passage out of England. Adrian directs Navarro to a local train station to make the drop, and tells him that money, a passport and a car will be waiting for him upon arrival. Jack chases Navarro to the station, but is far enough behind for Navarro to realize he's been played. Adrian picks up the device, and there's no car for Navarro. Jack corners Navarro with some help in the form of CIA backup. Navarro is cuffed and brought back to the station.
Jack goes into the station and sees Adrian with the device heading toward the train. He begins chasing after him, but is too far behind to catch him before the train takes off. Jack sees Chloe sitting alongside Adrian, and calls out for her, hoping she'll see or or hear him, but the train heads off down the tunnel. When Adrian and Chloe are safely away, Adrian explains his plan to Chloe. He's taking his override device back to show the world how vulnerable their defenses really are, which he plans to do by breaching their firewalls.
Jack rides back to the CIA station with Navarro. Ritter addresses the team about the situation, about both Jordan's death and the fact that Navarro was responsible for it. As Navarro is being brought in, Kate is told by one of the analysts that her husband was framed by Navarro, that the intel sold to the Chinese was fabricated. Jack asks Ritter if he's the one that can question Navarro as he may be the only one Navarro might fear.
Navarro seems like he's going to be a tough nut to crack. He immediately demands full immunity in exchange for the location of the override device, stating that he put a tracker on it. Navarro is fully confident that Jack won't be able to do anything to him (aka all the interrogation techniques that make Jack so awesome), but Jack squashes that notion by breaking Navarro's hand.
Navarro is brought to medical to have his hand tended to. Kate comes in with her gun drawn and tells everyone to get down. She immediately puts her gun up to Navarro's head, ready to kill him for what he did to her husband. Jack comes in to talk Kate down, but she isn't having any of it. Navarro spits out the access code for the tracker, thinking he's about to be shot. Kate puts her gun away, and the CIA begins to run the trace on the override device.
Boudreau and Audrey get into a small argument about what's been going on so far. Is it me, or does this marriage not seem to really be working? After Audrey leaves, Boudreau calls Anatol and gives him a way to track Jack via his communications link. Boudreau then heads into the meeting with Heller and his generals, expecting to hear about the immunity agreement for Navarro. Heller tells him that it won't be necessary, as the CIA has a fix on the override an that Jack and Kate are leading the team. Boudreau just can't seem to do anything right, can he? He tries to make amends by calling Anatol back, but he's not getting through.
Chloe and Adrian arrive at Open Cell's headquarters and see that everyone is dead. And not just dead, but gruesomely killed at that. They turn to head for the exit but are cut off by Cheng, the man who tortured Jack and turned Audrey into a vegetable. Cheng tells Adrian than he was supposed to create the override device for him, not for the rest of the world. Cheng's men connect the device, but notice the modifications Yates made. Cheng tells Chloe to fix it, and shoots Adrian in the knee to help persuade her. Chloe gets to work, reluctantly, and then when she's finished, Cheng's men get to work.
Adrian, knowing he's about to die, tells Chloe that he looked into the accident that killed her husband and son, and that is was just that. No one was trying to kill Chloe. It was just an accident. Chloe asks why he kept that from her, and he says that he was going to tell her eventually. Cheng then puts a bullet in Adrian's brain.
Jack and Kate are almost to the warehouse when they're ambushed by who we know to be the Russians. They get out of the car and engage in a firefight in the street. Jack and Kate both get away with their lives intact.
Cheng has his men send a message to what Chloe notices is a nuclear submarine. It's a fire order to sink a Chinese frieghter. The USS Massachusetts fires two torpedoes and the episode ends as Cheng likely started World War III.