''Detective Grimoire'' is a game about the titular detective, solving the mystery of a murdered janitor at a circus and in the second game, a murder at a swamp.

* ArtShift: The first game is very much an {{Animesque}} VisualNovel, complete with characters communicating entirely in grunts and electronic buzzing (much in the style of its [[PhoenixWright source of inspiration]]) - the background and tone are bleak and realistic, in-keeping with the Creepy Horror aesthetic. The sequel, on the other hand, has a much more quirky and colourful approach of European WesternAnimation ( la ''[[Film/TheSecretOfKells Cartoon]] [[WesternAnimation/SongOfTheSea Saloon]]''), with stylised (and animated) character models, full voice acting and lush hand-drawn backgrounds.
* UsefulNotes/BritishCoppers: Officer James, and he also is the only cop around most of the time. [[CaptainObvious The game is probably set in the UK.]]
* CreepyChild: The girl Grimoire meets at the entrance to both crimescenes and the 2nd person he meets after James in both cases. She gives you the map and her reapearance means you can access the another part of the map, given the fact that she's a little girl ''at a murder scene'', she's definitely creepy.
* CryptidEpisode: In the second game, the prime murder suspect is "Boggy," a creature rumored to live in the swamp. [[spoiler:The actual culprit was just someone in a costume, but Boggy ''does'' exist.]]
* DeadPanSnarker: Grimoire himself, to [[PhoenixWright Phoenix-worthy levels]]. Also Officer James, to a certain extent. And about anyone will gain this trait once they start mentioning [[RunningGag Grimoire's hat]].
* {{Expy}}: The main character looks like [[PhoenixWright Gumshoe]], the developers even note that they explicitly based Grimoire after him.
* GenreShift: The first game is a creepy Suspense Mystery with horror elements and traces of humour, whereas the sequel is a light-hearted Comedy Adventure Mystery with elements of Suspense and traces of horror.
* KilledOffForReal: The murder victims, naturally.
* MonsterClown: The game drops some pretty broad hints that the clown was the murderer. [[spoiler:He wasn't.]]
* NiceHat: A RunningGag is pointing out the aversion of the detective having a nice hat. He apparently has one in the sequel, before shortly losing the hat. [[spoiler:He gets it back in the end]]
* RunningGag: The hat, whether absent or not.
** "Your moustache is troubling me. That thing seems to be longer every time I see you."
* SequelHook: The second game end with 'ToBeContinued', tying in with the victim's background story.
* ShoutOut: Detective Grimoire makes a snarky remark about [[Franchise/ProfessorLayton the guy with the top hat]].
* StealthHiBye: The girl seems to vanish without a trace in both games.
* WhereTheHellIsSpringfield: The events of the two games take place either in Britain or in the US. Officer James wears a British uniform and talks in an English dialect, the toilet is labelled "W.C."[[note]]water closet, used in the UK but not in the US[[/note]], and the price signs of the first game's fair all carry '' symbols. Yet, Grimoire speaks in a ([[OohMeAccentsSlipping fake]]) American accent in the second game, as does half of the cast. It helps that the game was made in England.