The Big Sleep — Raymond Chandler (1939)

The Big Sleep by Raymond Chandler established the hardboiled private detective as American literature's defining moral figure, with Philip Marlowe serving as a knight of the mean streets in a corrupt world. Chandler's prose style is so distinctive that literary critic W.H. Auden called it a transcendent triumph; the novel's plot remains famously tangled, with Chandler himself unable to explain one murder victim's killer. The novel's complex narrative, though baffling, set a standard for atmospheric crime writing that few rivals have matched.