The unsolved murder is film noir’s way of acknowledging what its more optimistic police procedural counterpart refuses to admit: that some crimes are never resolved, some truths never established, and some killers never caught. These films sit with the discomfort of unresolution, exploring cases that the machinery of justice cannot or will not crack – whether because the criminal is too powerful, the evidence too thin, or the investigators too compromised. The unsolved murder leaves behind a wound in the community’s fabric that refuses to heal, generating the genre’s most persistent atmosphere of suspended dread.
The investigation of Laura Hunt’s apparent murder is conducted in a world where everyone has a motive and everyone is lying, and the detective’s obsession with the victim eventually surpasses his interest in solving the crime. Preminger treats the investigation as a meditation on obsession rather than a puzzle to be solved.
A radio crime narrator who has actually committed the murders he discusses professionally is investigated by a man who survived being murdered. Claude Rains brings his characteristic suave authority to the role of a murderer who has aestheticized his crimes into entertainment.
The murder of a Jewish civilian by one of a group of recently demobilized soldiers is investigated with the knowledge that the murderer is still among the men being questioned. Robert Young’s methodical, unhurried detective style is a model of patient interrogation.
A murder investigation stalls because the only suspect has an identical twin who provides a perfect alibi, forcing investigators to use psychological testing to determine which sister is the killer. Olivia de Havilland plays both twins in a film that uses the investigation as a psychological study of identity and pathology.
A man convicted of his wife’s murder cannot name the alibi witness who could save him, because she has apparently vanished entirely from the record. Ella Raines’s remarkable performance as the secretary who investigates alone is one of the first instances of the active female investigator in noir.
The murder of a model in a New York apartment is investigated through a relentless accumulation of procedural detail, following the investigation from its first confused findings through the city’s entire landscape. Dassin’s film insists that the city contains the truth, if you look hard enough and long enough.
Philip Marlowe investigates the theft of a rare gold coin and finds himself in a murder case that connects a wealthy household’s buried secrets to the criminal underworld. The film’s resolution leaves several characters’ fates deliberately ambiguous.
An amnesiac veteran’s attempt to discover who he was before the war turns into a murder investigation in which he is simultaneously detective and potential perpetrator. The film’s structural ambiguity – about both identity and guilt – is one of its most interesting features.
Philip Marlowe’s investigation of a blackmail case generates so many murders – including one whose killer cannot be definitively identified – that the screenwriters and even Raymond Chandler himself could not completely account for all of them. The unresolved murders are a feature, not a flaw.
A police detective investigating a violent armored car robbery pursues the remaining gang member through a city that has already consumed his partner. The film’s procedural efficiency serves as a counterpoint to the genre’s usual embrace of moral ambiguity.