Dirty Harry novels of the four first "Dirty Harry" films as tie-ins. Author and screenwriter Phillip Rock wrote the novelization of "Dirty Harry" in 1971, based on an early draft of the script. Mel Valley wrote the sequel, "Magnum Force", in 1973. Wesley Morgan novelized "The Enforcer" in 1976. The "Sudden Impact" novelization was written by Joseph Stinson, one of the screenwriters. Stinson, who had rewritten the originally independent script as a "Dirty Harry" vehicle for Eastwood, adapted the novel in 1983. Following "The Enforcer", Eastwood announced that he would not make any further "Dirty Harry" films (he eventually returned to the role
Dirty Harry Impact" in 1983 (directed by Eastwood himself) and "The Dead Pool" in 1988. In 2012, the film was selected for preservation in the National Film Registry by the Library of Congress for being "culturally, historically, and aesthetically significant". A killer (Andrew Robinson) shoots a girl in a hotel rooftop swimming pool. Police arrive at the crime scene, where SFPD Inspector Harry Callahan (Clint Eastwood) finds a blackmail note signed "Scorpio" ordering the city to pay $100,000 or he will continue to kill. The mayor (John Vernon) asks police officers what is being done to track the killer. During lunch, Inspector