New York cop John McClane is the personal target of the mysterious Simon, a terrorist determined to blow up the entire city if he doesn't get what he wants. Accompanied by an unwilling civilian partner, McClane careens wildly from one end of New York to the other as he struggles to keep up with Simon's deadly game. It's a battle of wits between a psychopathic genius and a heroic cop who once again finds himself having a really bad day.