The Long Goodbye (1973)

Robert Altman's mumbling, cat-feeding Philip Marlowe wanders through sun-dazed southern California under the delusion that old-school loyalty still means something. His passive complicity allows a sociopathic companion to manipulate him into shielding a murderer and precipitating multiple violent ends. When Marlowe finally recognises how thoroughly he was played, his belated retribution cannot undo the carnage his ignorance enabled.