The U.S. Federal Bureau of Investigation (F.B.I.) responds to a brief computer outage at their Cyber-Security Division by tracing down top computer hackers, finding several of them have been killed. Taking others into protective custody, the F.B.I. asks New York City Police Department detective John McClane (Bruce Willis) to collect Matthew "Matt" Farrell (Justin Long). McClane arrives in time to prevent Farrell from being killed by assassins working for a cyber-terrorist named Mai Linh (Maggie Q), who was working for her boss and love interest, Thomas Gabriel (Timothy Olyphant). En route to Washington, D.C. Farrell explains he had written a portion of security code for a large sum of money from Mai.
As they arrive in D.C., Gabriel orders his own crew of hackers to take control of the transportation grids and stock market, while nationally broadcasting a message threatening the United States. Farrell recognizes this as the start of a "fire sale", an attack designed to target the nation's reliance on computer controls, such that "everything must go". McClane and Farrell are taken by police escorts to the secured F.B.I. headquarters, but Mai, using the hijacked grids, reroutes the convoy into the path of an assault helicopter.
McClane takes down the helicopter by launching a police car over a damaged toll booth into it. As McClane and Farrell recover, Gabriel initiates a second broadcast, showing a simulated explosion of the U.S. Capitol building, sending the public into panic. Farrell recognizes that the next target of the "fire sale" is likely the power grid, and the two drive to a utility superstation in West Virginia.
They find a team led by Mai breaking into the station's controls. McClane kills them all, and obtains video footage of Gabriel, which they relay to F.B.I. headquarters. Enraged over Mai's death, Gabriel uses remote control of the station to redirect the natural gas supply into it. McClane and Farrell escape before the station explodes, leaving much of the eastern seaboard without power.
Farrell directs McClane to a fellow hacker, Frederick "Warlock" Kaludis (Kevin Smith), in Baltimore. Warlock, running his computer systems from several generators, identifies the piece of code Farrell wrote as a means to access data at a Social Security Administration building at Woodlawn, Maryland. They realize this building is a front for a U.S. National Security Agency facility, designed by Gabriel to download all personal and financial records in case of a cyber-security emergency such as this one generated by Gabriel himself.
Warlock reveals Gabriel's motivation. The talented hacker was once a top expert for the U.S. Defense Department. However, Gabriel was fired and his reputation was tarnished when he tried to sound the alarm about America's vulnerability to cyber-warfare. Gabriel detects Warlock's hack, speaks with him, Farrell, and McClane, and reveals that he has kidnapped McClane's estranged daughter, Lucy (Mary Elizabeth Winstead).
McClane and Farrell race to the Woodlawn facility. As McClane deals with Gabriel's men, Farrell discovers that Gabriel is downloading all the informati
Wikipedia Text
Live Free or Die Hard (released as Die Hard 4.0 outside North America), is a 2007 American action film, and the fourth in the Die Hard film series. The film was directed by Len Wiseman and stars Bruce Willis as John McClane. The name was adapted from New Hampshire's state motto, "Live Free or Die".
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