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 (character) that "I'll take all the edge I can get". When Al Quan becomes Callahan's partner in "The Dead Pool", the inspector respects Quan's experience but does not want to work with anyone because, he says, "most of my partners end up in the hospital or dead"; he warns Quan to "get a bulletproof vest". It is a recurring theme in the "Dirty Harry" films that Callahan has a high turnover of partners; most are killed or wounded while working with him. In "Dirty Harry", he mentions two unseen partners named Fanducci and Dietrich; Dietrich is in the hospital having been