John McClane goes global. For the first time, the New York City cop finds himself on an international stage as a fish out of water in Moscow. The film introduces McClane’s estranged son Jack, an apple that hasn’t fallen far from the tree, and who may even be more of a hard-ass than his father. John and Jack must put aside their personal and professional differences, and work together to keep each other alive and stop the Moscow underworld from controlling nuclear weapons.