[[quoteright:300:http://static.tvtropes.org/pmwiki/pub/images/TKKG_8946.jpg]]

A German childrens' detective series, and lately, a series of video-games as well. It is one of the most popular kid detective series in Germany, along with ''Literature/TheThreeInvestigators''. The title refers to the initials of the four main characters, Tarzan/Tim, Karl, Klößchen, and Gabi.

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!!''TKKG'' provides examples of:

* AdultsAreUseless: Usually played straight, averted with some of the more important adults, for example Gabi's dad Kommissar Glockner.
* AffectionateParody:
** ''Die Ferienbande'', a radio show about the friends Bernd (formerly Beate), Baul, Billy (nicknamed Bröckchen), Babsi and dog Bambi.
** The TabletopRPG ''1W6 Freunde'' (1d6 friends), which also parodies ''TheThreeInvestigators'' and EnidBlyton's ''TheFamousFive'', but mostly TKKG.
* AmateurSleuth: The titular group. Partially justified that some events are not of a scale where Police would get involved. Other times they support the Police with investigations of their own because friends are involved.
* AxCrazy: AlternateCharacterInterpretation for Tim, especially if you look at his track record and willingness to use violence. (But take this with a grain of salt: The kids have solved hundreds of crimes so far and barely aged a year, and also have no realistic CharacterDevelopment, so how probable is this after all?)
* BeautyEqualsGoodness: Rather the other way round - many criminals are pretty ugly.
* BigEater: Klößchen
* CityWithNoName: We know it has over a million people (so it has to be either Berlin, Hamburg or Munich), but WordOfGod says it's completely fictional.
* ComicBookTime: The current year is never mentioned, and the kids stay the same age (around 13) forever.
* ContinuityNod: Sometimes the characters meet people from earlier stories again.
* {{Cult}}: The JAA (Jünger aus Atlantis - Disciples from Atlantis), a sect somewhat inspired by Hare Krishna, Baghwan's sanyassins and the Moonies.
* TheCutie: Gaby has elements of this trope.
* DamselInDistress: At least a third of the stories put Gabi into some kind of danger from which she has to be saved by Tim.
* DoNotCallMePaul: After he couldn't be called Tarzan anymore for legal reasons, Tim stated that he had seen the ''{{Tarzan}}'' movie, [[TakeThat didn't like the protagonist]] and didn't want to be called by his nickname. In the German version, he ''also'' doesn't like his given first name Peter, so he prefers being called Tim, which is short for his second name Timotheus (after his grandpa).
* DoubleStandard: Gabi is usually sent home if it gets late or dangerous. The boys can do what they want.
* FiveManBand
** TheHero / TheLeader: Tiger (German version: Tim)
** TheBigGuy: Grunter, of course (in one scene, he breaks the door down by his sheer weight) but fulfilled by Tiger in others (Willi, nickname: "Klößchen", dumpling)
** TheSmartGuy: Kevin (Karl, nickname: the computer)
** TheChick: Katy (Gabi)
** TeamPet: Oskar, Gabi's dog
* TheGameOfTheBook: Came out in 1985, for C64 / Atari. During 1997 to 2009 16 more games with the characters were made, but those aren't based on any books.
* GoingColdTurkey: A schoolmate of Tim.
* GoodBadTranslation: Given the translation largely being for the benefit of Germans, catchphrases abound, including - "Is it true that you have the best machines of anybody in the town?". Also, rather archaic slang, such as "They've given her the Mickey Finn".
* IdenticalStranger: This trope happens in TKKG stories more often than statistically probable.
* InSeriesNickname: "Tarzan", "Computer", "Klößchen" and "Pfote". It's never mentioned who actually invented them.
* KidDetective: Kids solving mysteries at least some problems concerning authorities are averted because they have contacts who know they are trustworthy.
* KungFuKid: Tim qualifies, being just 13 / 14 (forever). Strictly speaking, he doesn't know Kung Fu but Judo and Jiu-Jitsu instead, but he's still pretty good at them for his age.
* [[LongRunningBookSeries Long Runner]]: Started in 1979, more than 167 books have been published by now. There also more than 100 audio books.
* MadScientist: At least one, probably more.
* ManEatingPlant: Mutant variety cultivated near the nuclear power Plant Fallaut by a [[MadScientist crazy botanist]].
* MistakenNationality: Tim has dark, curly hair and a tan (which becomes an InformedAttribute in the series and movies). At least once, some German racist mistook him for Italian or another foreigner.
* MoralDissonance: Tiger (Tim in the German version) quickly resorts to violence but never has to fear any consequences. If any of the bad guys would do that they would be in a lot of trouble.
* TheMovie: Two of them, in 1992 and 2006 respectively.
* NamesToRunAwayFromReallyFast: Several, likely to be combined with PunnyName. Example: the nuclear power plant "Fallaut".
* OfficialCouple: Gabi and Tim
* TheOtherDarrin: In the popular audio dramas, the speaker of Gaby changed twice yet, and her father's changed once.
* ParentalAbandonment: Played straight with Tim, whose mother lives in an other city. Averted with the others whose parents show up from time to time or are actually useful.
* PunnyName: For example, a nuclear power plant named "Fallaut", or "Scheich Ben Öhli" (Öl is oil in German)
* PutOnABus: Quite many teachers, relatives, classmates and friends of TKKG appear in exactly one book and are never mentioned again. Seems it's not easy to get into their circle of trust.
* TheSeries: Ran from 1985-87
* ShoutOut: There's a [[Film/DrMabuseTheGambler Doktor Mubase]], Karl's last name is "[[AlbertEinstein Vierstein]]"
* SmartPeopleWearGlasses: Karl
* StatusQuoIsGod
* TotallyRadical: Most of the slang is quite outdated or was never in use.
* TrademarkFavoriteFood: Chocolate for Klößchen
* {{Whodunnit}}: The second book. A classmate of the gang his disappeared, and there are several suspects: A blind clairvoyant [[spoiler:who fakes his blindness]], an Italian restaurant owner, and a bully from their school. All of them are pretty unsympathetic and have possible motives. At the end, they find out that [[spoiler:the victim "kidnapped" himself, because he was fed up with his parents; his father [[WhenYouComingHomeDad is preoccupied with his work as an architect]] and his mother spends her time imagining she was a reincarnated medieval noblewoman.]]
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