This is a case history of what must qualify as one of the finest police investigations in the annals of United States law enforcement. Almost certainly it represents the most crucial single victory to date in the ceaseless, frustrating war against the import of vicious narcotics into our country.

Gene Hackman returns in the role of hard-hitting detective Popoeye Doyle who travels to Marseilles in prusuit of the heroin dealers who he hit, but failed to kill in New York.