John Dickson Carr (1906-1977) was an American MysteryFiction writer, frequently known as the master of the LockedRoomMystery. Several of his works were published under the pen-name Carter Dickson. (He also had a couple of other pen-names that he used very rarely.)
His best-known work is probably ''The Hollow Man'' (US title: ''The Three Coffins''), part of his on-going ''Dr. Gideon Fell'' series. He also had a popular series starring the detective Sir Henry Merrivale, written as Carter Dickson. These two series make up a large portion of his work, but he also had a couple of other, smaller, series, and a number of standalone novels and stories.
He was a friend of Creator/ArthurConanDoyle (creator of ''Literature/SherlockHolmes''), and published a biography of Doyle in 1950. He also collaborated with Doyle's son on several Holmes stories after Doyle died.
!!Works by John Dickson Carr with their own pages:
* Literature/DrGideonFell series
* Literature/SirHenryMerrivale series
!!Other works by John Dickson Carr contain examples of:
* AnachronisticClue: In ''The Exploits of Sherlock Holmes'', co-written with Adrian Conan Doyle, one of the stories is about a woman being blackmailed through the threat of exposing documents proving that her late husband was already married before her, making their marriage invalid and their daughter illegitimate. Holmes, upon looking at the documents, notices that the name of the groom is written in a different ink than the rest of the document. That, by itself, doesn't mean much, since the groom might have carried a personal ink pot with him... if not for the fact that the documents are dated eight years before ink of that particular color was invented.
* BangBangBANG: Averted in one novel, where a firecracker is used to fake the sound of a gunshot to throw off the investigation.
* BeneathSuspicion: Remarked on in an essay on the FairPlayWhodunnit: "never remind the reader that a suspect has an airtight alibi, or he'll immediately be suspected. Treat it as such a given that it never occurs to the detective (or the writer!) to suspect Joe because Joe is so ''obviously'' innocent."
* BestServedCold: In "The Adventure of Foulkes Rath" (part of ''The Exploits of Sherlock Holmes'', co-written with Adrian Conan Doyle), Holmes says the proverb ("the old Sicilian adage that vengeance is the only dish that is best when eaten cold") after it turns out the murder victim was killed by a person whose brother he framed for robbery and murder twenty years ago.
* BottomlessMagazines: Spoofed in ''Fatal Descent''. An editor mentions "Now, it distinctly states (page 96) that the hero's gun is a six-shooter. By going back and counting the bangs, I discover that in the excitement of the moment, he has now fired 13 shots without reloading."
* BrotherSisterIncest: In ''The Demoniacs'', the early-eighteenth-century detective has come to suspect that his girlfriend is his half-sister. [[spoiler: She isn't.]] If she is, he wants to find and destroy the evidence so he'll be able to marry her anyway. When he admits that to her, [[spoiler: ''after'' finding out she isn't related]], she's pleased rather than squicked; she plainly feels it's ''romantic''.
* CaptainErsatz: In ''Captain Cut-Throat'', the English spy Alan Hepburn and his wife Madeleine are very reminiscent of Sir Percy Blakeney and his wife Marguerite in ''Literature/TheScarletPimpernel''. The role of [[TheSpymaster Chauvelin]] is taken by HistoricalDomainCharacter Joseph Fouché, the head of Napoleon's secret police.
* CloseCallHaircut: The climax of ''The Bride of Newgate'', set in 1815, is held up by the arrival of a minor character at Darwent's house, demanding satisfaction for mostly plot-irrelevant issues. Darwent and everyone else (including the reader) is impatient to go on with the plot, but as the intruder is AnOfficerAndAGentleman he can't refuse the duel. Riled, but not wanting to kill or seriously injure the man, Darwent (who, before being made a peer, was a fencing master) shaves off some of his hair and both of his impressive and stylish sideburns. [[spoiler:Then his maddened opponent accidentally charges through a false wall, revealing the hidden room that holds the central mystery and kick-starting the climax proper.]]
* ConvictionByContradiction: Carr specifically warns aspiring mystery writers about this kind of clue in his essay "The Greatest Game in the World." Of course, if you do what he advocates, having guilt depend on a series of clues rather than just one, you won't have that problem.
* DealWithTheDevil: ''The Devil in Velvet'' opens with the protagonist selling his soul to the Devil to travel back in time. The Devil keeps up his end of the bargain, but (of course) has a few jokers of his own to play.
* DyingClue: In [[spoiler: ''Patrick Butler for the Defense'']], the victim says before dying to the person trying to assist him "It was your gloves". [[spoiler:It had previously been established that the victim only spoke French and that a TranslationConvention was being used. In French, "your gloves" is "vos gants", which sounds similar to the murderer's name "Vaughan".]]
* FairPlayWhodunnit: His stories always showed you all the clues. The only problem was usually that the murder was ''impossible'' to begin with, so you couldn't figure out ''how'', much less who. Carr's essay "The Greatest Game in the World" makes a key point about what makes a Fair-Play Whodunnit really fair, and good when done right: the key to the case isn't just one clue -- a random word hidden in chapter six -- but a system of interlocking clues that allow the reader to open a tapestry of interpretation that gives a larger picture: that of the truth.
* FalseReassurance: Done in ''The Nine Wrong Answers'' in the form of footnotes that can be misleading at best, and a razor thin edge from outright lies at worst.
* FantasyAllAlong: A dark example from the standalone novel ''The Burning Court'': [[spoiler:The detective comes up with an rational explanation for the murder mystery in the penultimate chapter. But in TheStinger chapter, we learn that Marie Stevens is most likely a witch, quite probably the reincarnation of a 19th century murderer, and that she framed the woman who was arrested for the murder.]]
* GenreSavvy: The standalone ''The Nine Wrong Answers'' periodically stops to warn the reader that if s/he thinks such-and-such is the case, s/he's wrong.
* HiddenInPlainSight: In one story, a killer hides a glass knife by dropping it into a jug of water.
* IWasQuiteALooker: In ''The Demoniacs'', the hero's girlfriend discovers that a certain very decrepit old-looking woman is younger than she looks -- and might be her long-lost mother. The girl is quite upset by the possibility that she might come to resemble this hag.
* LockedRoomMystery: Carr, the acknowledged master of this back in the golden age of crime fiction, provided all sorts of different ways to accomplish this.
* MagicAIsMagicA: Carr's commitment to the Fair-Play Whodunnit, where everything necessary to solve the mystery must be laid in front of the reader, meant that in those rare cases where he wrote a story involving the supernatural, the rules the magic operated by were clearly explained. For example, in ''The Devil in Velvet'', Professor Nicholas Fenton makes a Deal with the Devil to go back in time and try to solve (even better, prevent) a murder; he and the devil hash out a detailed contract as to how this is to happen, and the precise terms of the contract end up being relevant to the denouement.
* MetaphoricallyTrue: ''The Nine Wrong Answers'' has authorial footnotes that use this trope to an almost gleeful extent, to the point that the final one points out that at no time did previous footnotes ''technically'' lie about niceties like [[spoiler:whether a man who was poisoned actually died, and whether a man really was who he was claiming he was.]] (Although some critics maintain that Carr slipped in a few places and really ''did'' make the "incorrect" claims.)
* NoFourthWall: In ''The Nine Wrong Answers'', the narrator regularly halts the action to inform the reader that if you think such-and-such is the case, "you're wrong."
* RightHandCat: Etienne Galant, the BigBad in ''The Corpse in the Waxworks'', is seen stroking a white persian. The book was published in 1932.