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- Clue / Cluedo
- Most of Nancy Mitford's body of work, but especially The Pursuit of Love and Love In A Cold Climate. The various TV adaptations fall under this heading as well.
- G. K. Chesterton's Father Brown stories.
- Former Trope Namer Agatha Christie:
- The Secret Adversary (1922), which introduced Tommy and Tuppence not so long after they were both out of work due to the end of World War I. Partners in Crime (1929) is a series of linked short stories about their joint venture in running a detective agency. Unlike Poirot mentioned above, Tommy and Tuppence aged roughly in real time.
- Christie's final novel Curtain actually does provide a timeframe for her stories (or at least the ones about Poirot, though this would probably drag a lot of others into the mix as well by proxy due to overlapping characters), placing them in the period of the early 1920s through the early 1940s. This may not always be consistent with the details of all of her stories but at least it's established.
- Kerry Greenwood's Phryne Fisher mysteries, which are mostly set in Australia during 1928 (although the last two books have moved into 1929, and Murder in Montparnasse had flashbacks to post-World War I Paris).
- Ngaio Marsh's Roderick Alleyn mysteries.
- The Lord Peter Wimsey Mysteries by Dorothy L. Sayers.
- Various books by Evelyn Waugh, most notably Vile Bodies and Brideshead Revisited, though the latter averts this by telling the story through characters during the war reminiscing about the life they've lost.
- P. G. Wodehouse's Jeeves and Wooster stories are often remembered as this, but in fact they do have occasional references that establish the passing of time (there's a past-tense mention of World War II in at least Ring for Jeeves - which is a bit of Oddball in the Series - and short story Bingo Bans the Bomb is set in context of nuclear disarmement protests). The TV series is definitely and deliberately set in Christie Time, though.
- Wodehouse himself was a bit inconsistent on this point; asked point-blank when his novels were set, he said "Between the wars, rather", and sometimes excused the out-of-dateness of his settings by claiming that he wrote "historical novels". He also confessed to not knowing how old his characters were.
- To make things even more confusing, George Orwell put forward a case that Wodehouse's stories are in fact Two Decades Behind, and that for all intents and purposes they are set in The Edwardian Era.
- Jean Ray's Harry Dickson novels.
- E. F. Benson's Mapp and Lucia books.
- Leslie Charteris' first few dozen stories about The Saint. But poor old Simon Templar, an RFC veteran from WWI, was still debonairly thirtyish in WWII, and still in harness in the 1983.
- Jo Walton's Alternate History Small Change trilogy takes place in an extended Genteel Interbellum Setting: Britain's fascist-sympathetic government stays out of WWII, while one main character is a homicide detective whose investigations drag him deeper and deeper into a conspiracy trying to keep it that way.
- Most of H.P. Lovecraft's stories take place in this time period, appropriately enough as it covers the span of his litterary career and far preferred Ye Olde Anglo-Saxon way of life to the hustle and bustle of contemporary urban America; as the setting is Lovecraft Country, it remains credible.
- S.S. Van Dine's erudite and sublimely supercilious Philo Vance.
- Many of Rex Stout's early Nero Wolfe novels are set in this period.
- Richard Lockridge's husband and wife detectives, Mr And Mrs North.
- Dashiell Hammett's The Thin Man epitomizes the high-life in New York during this period.
- The Phantom Detective provides a pulp-hero version of the genteel detective.
- Damon Runyon's works are some of the definitive "Everyone's-a-gangster-and-wears-hats-while-talking-snappy" incarnation of the era.
- The Ellery Queen series had its origins in this setting.
- Erich Kästner's comedy Drei Männer im Schnee (Three Men in the Snow), including snooty servants, big cars, and a second date engagement.
- A few Biggles books set during his "freelance Gentleman Adventurer" period before his Mandatory Unretirement to fight the Nazis take place in this setting, most notably Biggles and Co, which was basically a standard issue detective story with added Sky Pirates.
- Madeline and to a lesser degree the first book of Babar take place in a particularly Gay Paree-flavoured version of this trope. Note that the former was published in the very tail-end of this period, in 1939.
- Consider The Lily is set in England among the landed gentry in 1929
Live Action TV
- Carry On Laughing!: the "Lord Peter Flimsy" episodes.
- Doctor Who: "Black Orchid" and "The Unicorn and the Wasp", plus bits of "Carnival of Monsters".
- Downton Abbey moves into this period starting in Episode 7 of Series 2, Series 1 being firmly Edwardian and the first six episodes of Series Two being set during World War I.
- Jeeves and Wooster
- Poirot. Like the above, the early seasons also had opening titles which were essentially pure distilled Genteel Interbellum Setting, although in being on the "murder mystery" side of the spectrum rather than the "wacky romantic misunderstandings" end they're a bit Darker and Edgier.
- Until Autumn
- Upstairs Downstairs and its lookalike The Duchess Of Duke Street, for the most part, though both actually run from about 1900 to 1930.
- You Rang, M'Lord?
- Max Raabe and Das Palast Orchester are a modern jazz orchestra from Berlin that specializes in music of this era (and performing covers of modern pop songs in the same style).
- The first Laura Bow game, The Colonel's Bequest takes place in this setting. The story is set in 1920s Louisiana, and Laura's friend Lillian along with all of Lillian's family are invited to her uncle's slightly decrepit bayou plantation, where he announces that he is drawing up his will to split his money between them. Everyone, regardless of whether they are elderly Grand Dames, glamorous young actresses, or ne'er do well rogues, has a secret to hide or knows the secrets of someone else present, and it isn't long before a series of murders begins...
- The Professor Layton series seems to be set in this, but the anachronisms flow so thick, you might as well chalk it up to Purely Aesthetic Era.
- Amiga game Murder! is set in this kind of environment; the player character is in a mansion with a dead body and a lot of guests with secrets and has two hours to solve the crime before the police show up.
- The Last Express is set in 1914, just before WWI, is filled to the brim with Art Nouveau and is about a murder on the Orient Express.
- The Legend of Korra is set in an alternate universe 1920s to 1930s aesthetic bonded with Asian elements.