When someone hacks into the computers at the FBI∙s Cyber Crime Division; the Director decides to round up all the hackers who could have done this. When he∙s told that because it∙s the 4th of July most of their agents are not around so they might have trouble getting people to get the hackers. So he instructs them to get local PD∙S to take care of it. And one of the cops they ask is John McClane who is tasked with bringing a hacker named Farrell to the FBI. But as soon as he gets there someone starts shooting at them. McClane manages to get them out but they∙re still being pursued. And it∙s just when McClane arrives in Washington that the whole system breaks down and chaos ensues.
Follows the cross-country adventures of the pot-smoking duo as they try to outrun authorities who suspect them of being terrorists when they try to sneak a bong on board their flight to Amsterdam.