Iconoclastic, take-no-prisoners cop John McClane, finds himself for the first time on foreign soil after traveling to Moscow to help his wayward son Jack - unaware that Jack is really a highly-trained CIA operative out to stop a nuclear weapons heist.
When the White House (Secret Service Code: "Olympus") is captured by a terrorist mastermind and the President is kidnapped, disgraced former Presidential guard Mike Banning finds himself trapped within the building.
Virgil Oldman is a world renowned antiques expert and auctioneer. An eccentric genius, he leads a solitary life, going to extreme lengths to keep his distance from the messiness of human relationships.
A DEA agent and an undercover Naval Intelligence officer who have been tasked with investigating one another find they have been set up by the mob -- the very organization the two men believe they have been stealing money from.
Teacher Linda Sinclair (Julianne Moore) balances her staid home life with an incredible passion for her subject, but her routine is forever altered when a former star pupil and his unsupportive father reenter her life.