WATCH TRAILER OF THIS FILM HERE

In the past few years, aging police officer John McClane (Bruce Willis) has spent his time in and out of Alcoholics Anonymous and is divorced from his wife. John is still part of the NYPD and is given a task by the FBI to pick up a young hacker named Matt Farrell (Justin Long) for questioning. On his way to turn Matt Farrell into custody, he experiences a modern version of a terrorist attack first hand when he gets stuck in traffic. A group of hackers, headed by Thomas Gabriel (Timothy Olyphant), have struck at the vulnerable United States computer infrastructure and are systematically shutting it down, beginning with the traffic light system.

Gabriel used to work for the government and warned them of a technological attack but was fired and then planned the attack as revenge . As they move on to crash banking networks and the stock market, the indices plummet and America's economy becomes crippled. McClane soon discovers that the recently captured Matt understands exactly what the terrorists are doing and what steps they are taking to achieve their mission. Soon, McClane and Farrell are trying to stop the terrorists before the entire nation collapses. At some point in the film the cyber-terrorists kidnap McClane's daughter, Lucy (Mary Elizabeth Winstead).