William Foster (Michael Douglas), AKA D-FENS, is an unemployed, divorced engineer in the defense industry who's reached his boiling point. First he finds himself in gridlock, which he deals with by abandoning his car. He subsequently happens across an unhelpful convenience store clerk whose prices D-FENS 'rolls back', by demolishing the store with a baseball bat after overpowering the clerk. Soon he finds himself in gangland, and deals with some tough-looking gang members by attacking them and running them off. When the gang members try to retaliate, it fails when they crash their car and D-FENS takes their bag full of guns. Unfortunately for him, a retiring cop (Robert Duvall) is on his trail, and soon things will come to blows as D-FENS heads towards Venice for his young daughter's birthday party