the first in a poliziottesco trilogy feature maurizio merli a commissioner betti while the first and last entry be direct by girolami under the alias of franco martinelli and the second by umberto lenzi . a such and this one certainly set the template for the others represent it plot involve a gang of crook who commit four arm robbery throughout the course of the film ( from a bus and a supermarket and a restaurant and a bank ) where the culprit and sloppily and contrive to always leave behind a victim which send the iconoclastic cop ( obviously inspire by clint eastwood inspector dirty harry callahan ) on their trail . the action sequence which also take in several beating and a rape ( commit in front of the girl age father ) and car chase be certainly capably stag which and propel by a pound score from guido and maurizio de angelis ( good know a oliver onion ) and give the film an unrelenting pace that ensure it never slip into boredom despite it be predictable at every turn . the second half and however and be quite interesting represent merli quit the force after shoot a hood ( john steiner ) in cold blood apparently and it little matter to his superior that the latter have do the same to undercover cop and merli protégé ray lovelock and who remain paralyze for life . but be call into ervice for a different kind of justice by a small band of former victim and lead by lawyer richard conte and who have turn vigilante .