And also in the back seat of an SUV next to Samir, who tells him he did the right thing. "She'll die for a good cause." Tarin just looks sad. Is he going to change his mind again?

Chloe tells Kiefer and Cole that one of the bad guys is Tarin Faroush. "Kayla said he sacrificed himself to save her, but he's still alive." "What the hell's going on?" Cole wonders. Excellent question, Cole. I have no idea myself. Kiefer realizes the terrorists demanded a file they knew they'd never get, and says he needs to talk to Hastings, who is already on the line. "You cannot let Kayla Hassan in!" Kiefer says. "The terrorists faked her escape. They wanted to get her to CTU." Hastings asks why. "What's the best way to disarm New York's radiological defenses?" We don't have time for a pop quiz right now, Kiefer. Fortunately he doesn't wait long for the answer before supplying it himself: "Taking out CTU. There's gotta be something in the car, some kind of a bomb. You need to stop her now!" Hastings asks Chloe where she is. "My God," Chloe says, watching Kayla's approach over the monitor. "She's in the tunnel!" Man, I knew that tunnel entrance was going to be trouble one of these hours.

Hastings takes off running, hollering, "Security!" The slow, melodramatic approach Dana had been making toward Prady is rudely interrupted by Hastings yelling at her, "Dana, with me!" She immediately breaks into a sprint herself. Kiefer asks Chloe for a current location on Tarin's car, and she says it's crossing into Brooklyn and taking the first exit off the Williamsburg Bridge. "We cannot lose him, do you understand me?" Kiefer says. Which can only mean they're going to lose him.

Kayla pulls right up to the underground security entrance at CTU, with alarms going off everywhere. The uniformed guards scramble, telling Kayla to get out of the car at gunpoint. Hastings yells at Dana to call the bomb squad, and she picks up the security desk phone to do so. The uniformed guard looks inside the car Kayla just got out of and notices a fat cable running through the back seat and disappearing between the cushions, probably plugged into the cigarette lighter. "Hastings, Did you stop that car?" Kiefer says, "Not in time, Jack," Hastings responds. "Hold on, just hold on!: The back seat is lowered, revealing a very large cylindrical device in the trunk with a digital timer on it. The readout? 17 seconds and counting. So either the terrorists had her arrival at CTU timed down to the half-minute, or the timer was wired to a GPS that was programmed to start a short countdown when Kayla hit the tunnel entrance. I don't mind doing that work when the episode is this good. "It's an EMP!" Hastings yells, and runs back inside. Kiefer asks if they can shut down their systems to protect the drones, but Hastings says there's no time. The guard gets behind the wheel of the car to try and move it away in time, ignoring Hastings' order to get away from it. Everyone else runs away, and the guard looks up just as the timer hits zero. There's a blinding flash and a shockwave that first totals the car, then sends everyone tumbling to the floor. That covers the other guards still in the tunnel, Hastings, Dana and Kayla, and Prady. The glass of the security entrance (yet another bad idea) shatters. On the floor, every screen goes blank-white and every headset sends a painful scream into its wearer's ear. It's a chaotic scene, with the lights flashing in and out and nobody knowing what's happening and everyone screaming like they're on the fricking Poseidon while it's flipping over.