McClane tells him they're driving to Washington DC. The high-strung Farrell is astonished by McClane's calmness during the ordeal. McClane and Farrell race down the fire escape, McClane killing various henchmen on the way. Debris from the shootout sets off the explosion of Farrell's computer, destroying the apartment. McClane kills several thugs who enter the apartment. Gabriel's assassins, who had the apartment under surveillance to confirm Farrell's execution, open fire. McClane is sent to pick up Farrell in Camden, and his arrival interrupts the hacker just before he performs the operation which would detonate his computer. Simultaneously, the FBI command center's computers are momentarily disrupted, leading Deputy Director Bowman ( Cliff Curtis) to order a roundup of all the hackers who could conceivably have been involved. She leaves in a huff, refusing to acknowledge her father's last name but calling herself instead by her mother's maiden name, Gennero. New York City Detective John McClane ( Bruce Willis) breaks it up the girl turns out to be his estranged daughter Lucy ( Mary Elizabeth Winstead). Meanwhile, a young couple is making out in a car at Rutgers University in New Jersey. This involves using a virus he has implanted that detonates wired explosives attached to the hackers' computers when they press the delete key, and commencing the initial stages of a computer attack on US government networks. Gabriel's operation begins with orders to kill the hackers he hired, including Farrell.

Computer hacker Matt Farrell ( Justin Long) finishes work on a new program and sends it to Mai Linh ( Maggie Q), who advises her boss and lover, Thomas Gabriel ( Timothy Olyphant), that they can now proceed with their operation.The synopsis below may give away important plot points.

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