"The Stone Killer (1973)" Movie on Dvd

Top detective Lou Torrey is transferred to Los Angeles and uncovers a plot by a Sicilian mafioso to use Vietnam veterans to murder all his enemies in a rerun of the "Sicilian Vespers" when the previous generation of Sicilian mafiosi were all killed on a single day. Torrey gets various clues that something big is about to happen but will he discover what is planned before the big day ?