Investigation of a Citizen Above Suspicion is a 1970 Italian satirical crime thriller film directed by Elio Petri, starring Gian Maria Volonté and Florinda Bolkan. It is a psychological, black-humored satire on corruption in high office, telling the story of a top police officer who kills his mistress, and then tests whether the police would charge him for this crime. He begins manipulating the investigation by planting obvious clues while the other police officers ignore them, either intentionally or not.

Plot

A recently promoted police inspector, nicknamed "Il Dottore" ("the Doctor", an Italian honorific) kills his mistress, and then covers up his involvement in the crime. He insinuates himself into the investigation, planting clues to steer his subordinate officers toward a series of other suspects, including the woman's gay husband and a student leftist radical. He then exonerates the other suspects and leads the investigators toward himself to prove that he is "above suspicion" and can get away with anything, even while being investigated.