I feel like a lot of recommendations here are for mystery VNs in general. The OP specifically asked for 'detective-style investigations,' which to me implies a procedural element of evidence collection and logical deduction, not just a mysterious plot.
In 'Ace Attorney Investigations 2', the logic chess segments are phenomenal. They simulate mental battles where you break down a witness's testimony by predicting their responses. It's interactive deduction at its best.
You've gotta start with 'The Ace Attorney' trilogy, right? Phoenix Wright might be a defense attorney, but the investigation phases are pure detective gameplay—examining crime scenes, presenting evidence, and cornering witnesses.
Don't overlook 'Layton Brothers: Mystery Room' on mobile. It's a simplified but fun detective game from the Professor Layton universe where you examine crime scenes and deduce the culprit from the evidence.
The 'Ace Attorney Investigations' spin-off stars prosecutor Miles Edgeworth and is structured entirely around crime scene investigation and logic chess to deduce the truth, which is as detective as it gets.
2026-07-22 23:20:33
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Her Secret Investigation
Kelasikwa
10
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A series of past murders catch the attention of the police and the media.
All the people who were killed were women, all of which had some sort of relationship with a well known and successful businessman named Asriel Parker.
For some reason, the murders all point to him as the number one suspect and connection between them. The reasonable thing to do is to put him behind bars but there is one problem.
"Everyone is innocent in the eyes of the law until proven guilty."
There isn't a shred of evidence that actually pinpoints Asriel Parker as the culprit.
With that statement in mind, Selena March, a good police officer and detective is sent undercover as his live-in Personal Assistant to dig up whatever information she can use to put the murderer behind bars.
Selena has no idea what she signs up for but she knows for a fact that falling in love is not part of the whole 'undercover' mission
There are three things Samara Culkin loves: her father, wearing high heels, and being a detective. But in a world where being a female officer is considered weak, she struggles to find a place where she feels truly belong. Determined to prove The Detective Tag firm that she is worth it, she sets out to solve one of the biggest cases the city of Los Angeles has ever seen.
There are three things Clayton Jones likes: his car, detective skills, and the female detective who happens to catch his eye—Samara. As an expert and well-known crime officer, he is given the chance to work with her; a one-time possibility that rarely happens. The only problem is that she hates him. And he does not know why.
The Detective Tag is a crime fiction with a twist of romance. Join Samara and Clayton—all the bitterness, dislikes, and romance in between—as they dive into the world of crime cases and murder investigations.
Well, maybe a bit of finding love, too.
Murder Inquiry is a crime fiction, whose plot is about Edwin Wolfgang, a rich New York based banker, who gives out loans for which he accepts artworks as collateral, but kills his customers before they are able to pay back the loan. And a FBI agent attached to the New York field office, who's charged with the task of bringing Mr Wolfgang to book. The story is set in three cities, in three different continents, and is full of twists and turns from the killing of Wolfgang's last two victims, up to his eventual arrest.
I didn't kill my asshole ex-boyfriend.
I knew I might've said I would countless times in the text I sent before we broke up, and I wasn't the calmest person.
But I really didn't kill him.
I, however, am the number one and only suspect of his murder since to everyone else he was a sAiNt. But hey, let's not talk ill of the dead.
The point is, I was stuck at the station being questioned about something I didn't do. And I thought it was the worst thing that could've possibly happened to me.
That is, until I set eyes on the detective of the case.
I may just play along for a while. See where this thing goes....
A story about a heroine as she experiences the ups and downs of a high school life while striving to finish her mission as a secret spy. But, is it really that easy being a secret spy in high school?
I'm Caleb Jennings. When I announce my early retirement, everyone in the city cheers. Only Nathan Sloan, my junior from the police academy, who claims to be able to see things from the criminal's perspective, panics at the news.
During the party organized in his honor, he openly states his intention to find me.
"I owe my success to the guidance Caleb Jennings has provided me all along. I hope everyone can help me find him and bring him back into the police force."
Scoffing, I choose to ignore that.
…
In my previous life, I was the celebrated captain of a criminal investigation team. Yet, whenever I uncovered a clue, Nathan, a rookie in the city police department, would announce it first, beating me to it.
After multiple incidents like this, everyone started saying that I was past my prime.
To prove myself, I worked myself to the bone for three months before finally locating the hideout of a human trafficking ring. However, when I arrived on the scene with my team, Nathan had already swept through the place.
He was launched into stardom, becoming the rising star detective that everyone adored.
As for me, the public mercilessly tore me apart, labeling me as incompetent and shaming me.
Due to the pressure from work and the negative public opinion directed at me, my mind was distracted. I ended up getting killed while hunting down the remnants of the trafficking ring.
When I open my eyes again, I find that I'd gone back in time—to the day we launch a raid on the human traffickers' hideout.
Has anyone mentioned 'Disco Elysium'? It's not a traditional VN (more of an RPG), but the dialogue and inner monologue are so dense it feels like one. The detective work is entirely cerebral and psychological. You're a broken cop rebuilding a case from scratch by talking to people, examining your own psyche, and making skill checks based on your stats.
It's the deepest, most immersive 'detective work' I've ever experienced in a game, focused on ideology, memory, and human connection over mere forensics.
For a cozier mystery, there's 'A Summer's End — Hong Kong 1986'. It's a paid game, but stunning. If we're sticking strictly to free, maybe look for jam game submissions from events like NaNoRenO. Developers often release short, complete mystery VNs for free during those game jams. The quality can be surprisingly high, and you get to experience a wide variety of art and writing styles. I found a fantastic 30-minute noir mystery that way last year. It's like digging through a thrift store for unique, one-off stories.
The 'Arcade Spirits' games are dating sims set in an arcade, but the sequel, 'The New Challengers', has a stronger mystery element. Something strange is happening with the game tournaments, and you investigate while managing your relationships. It's lighthearted and fun, with the mystery serving as a plot engine to bring the cast together.