Picking up three years after the events in Magnum Force, a threatening terrorist group called, The People's Revolutionary Strike Force declare war to the city of San Francisco and demand a ransom to be paid, otherwise they plan to blow the city apart. While Inspector 'Dirty' Harry Callahan is at a limbo following his unorthodox method during a robbery, he's at it to dispatch the terrorist group, by playing their game by being more dirty than ever. But this time, he's got a new partner, which...

A vicious serial-killer is on the loose in San Francisco and the police trace a link to a small town further down the coast. When Harry Callahan upsets the press and the mayor in his usual style, he's shipped out of town to investigate while the heat is on. With the help of his new Magnum handgun Harry goes on the trail leaving behind the usual trail of dead criminals along the way.