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An old-fashioned cop emerges to foil a high-tech attack on the countrys computer infrastructure as Bruce Willis brings back one of the biggest action franchises in screen history. Its been over a decade since audiences last saw New York cop John McClane (Willis), but now, as the worlds greatest criminal mastermind (Timothy Olyphant) attempts to cripple the entire country with an innovative act of technological terrorism, only one cop can insure that the integrity of the system stays intact. In this, the fourth installment of the long-running action series, Underworld director Len Wiseman picks up the torch formerly carried by directors John McTiernan and Renny Harlin to helm a script penned by Mark Bomback. ~ Jason Buchanan, All Movie Guide