When a man calling himself "the Scorpio Killer" menaces San Francisco, tough-as-nails Police Inspector "Dirty" Harry Callahan is assigned to track down the crazed psychopath.
The McMillans befriend Billy Benton, quarterback for the Hawks, who is either innocent or involved in a plot to throw the game. A $75,000 bet was made against the Hawks, and the bettor intends to collect at any cost, even murder.
