At Oxford, a young Northern Irish man, John O'Brien - a member of a mysteriousparamilitary group called The Organisation - is hard at work on plans for aterrifying, turbo-charged military vehicle, the VIPER (Vehicle for Interception,Protection, Elimination and Reconaissance), which is intended for urban warfare.O'Brien is captured by British Intelligence, and the computer discs holding theplans are confiscated. They construct the VIPER, but can't figure out how tooperate it. O'Brien is threatened with torture by chainsaw, but refuses todivulge the information.
Organisation leader Hawk sends his top man, Stone, from Ireland to infiltrate theBritish Intelligence base, rescue O'Brien and bring back the VIPER.