Dirty Harry is a 1971 American neo-noir action thriller film produced and directed by Don Siegel, the first in the Dirty Harry series. Clint Eastwood plays the title role, in his first appearance as San Francisco Police Department (SFPD) Inspector "Dirty" Harry Callahan. The film drew upon the real-life case of the Zodiac Killer as the Callahan character seeks out a similar vicious psychopath.
A psychopathic sniper, later referred to as "Scorpio", shoots a woman while she swims in a rooftop pool. He leaves behind a threatening letter demanding he be paid $100,000 or he will kill more people. The note is found by SFPD Inspector Harry Callahan. The mayor teams up with the police to track down the killer, although to stall for time, he agrees to Scorpio's demand over Callahan's objections. During his lunch break, Harry foils a bank robbery. He shoots one robber dead, and holds another at gunpoint with his Smith & Wesson Model 29 revolver, bluffing him to surrender with an ultimatum: