When they are called upon to investigate a sex murder, Melville and Pignon (Jean Carmet and Jean-Pierre Marielle), two rude and crude (not to mention racist) policemen, find themselves in the midst of the multicultural machinations of members of the international film community in fashionable St. Tropez. The real culprit is an extremely clever man, who knows that they can be counted on to arrest the most obvious suspect while he looks on. Nonetheless, they are dogged, serious men who hunt down every clue, and are unfazed by the carryings-on of the excitable artists they encounter.