Dirty Harry local and federal police committing offences and overstepping their authority by entrapment and obstruction of justice. Author McGilligan, argued that America needed a hero, a winner at a time when the authorities were losing the battle against crime. The box-office success of "Dirty Harry" led to the production of four sequels. In the 2007 film "Zodiac", also set in San Francisco and inspired by the Zodiac Killer, cartoonist Robert Graysmith approaches police detective Dave Toschi at the cinema, where he is watching "Dirty Harry" with his wife. When Graysmith tells Toschi he is going to catch the Zodiac killer, Toschi
Dirty Harry novels Dirty Harry novels "Dirty Harry" novels include film novelizations and original tie-ins based on the "Dirty Harry" film franchise. Like the films, the novels portray Inspector "Dirty Harry" Callahan as he ruthlessly fights criminals. Novelizations of the first four films, "Dirty Harry", "Magnum Force", "The Enforcer", and "Sudden Impact", were published between 1971 and 1983. Additionally, after star Clint Eastwood announced he would make no further "Dirty Harry" films after "The Enforcer", Warner Books published twelve new novels attributed to Dane Hartman, a collective pen name used by at least three authors, between 1981 and 1983. Warner Bros. licensed novelizations