Nakamura Detective Agency

Enter the underworld of Osaka, a place of corruption, prostitution, drugs, organized crime, and violence. Former police officer Kyoko Nakamura dedicated her life to protecting those who couldn’t protect themselves. But after learning firsthand how little the system cares about people who fall through the cracks, Kyoko made it her mission to be the one person those people can count on. Now, with the assistance of her colleagues, the Nakamura Detective Agency serves as the one ray of light in the seedy underbelly of one of Japan’s biggest cities.

Hopeless
Nakamura Detective Agency · Book 0

Hopeless

A Kansai Mystery
Send to E-Reader and Enjoy!

Some things can't be helped

Before the agency had a name on the door, there was just Kyoko Nakamura, working alone out of her apartment, taking whatever cases came her way.

Most of them are the same: cheating husbands, suspicious wives, proof that people rarely deserve the trust they ask for. It's not glamorous work, but it pays the bills.

Then a woman named Misaki Kuroyama calls with something different  er brother, Shinji, has vanished. He dropped out of school years ago, cut ties with his family, and made a living as a host in one of Osaka's late-night clubs. The police have already written him off as a runaway. Misaki hasn't, and she's willing to pay far more than the case is worth to prove it.

For a former cop turned private investigator, it's a chance to do the kind of work she actually misses—real investigation, not just surveillance photos and paperwork. But Osaka's mizu-shobai nightlife doesn't give up its secrets easily, and the deeper Kyoko digs into Shinji's disappearance, the more she suspects Misaki hasn't told her everything.

A tightly-wound short story set before Fallen Idol, Hopeless is a glimpse into Kyoko Nakamura's early days as a solo investigator — sharp, world-weary, and already too good at reading the lies people tell themselves. Perfect for readers who want to meet Kyoko before the case that changes everything.

Previously published in The Dame Did It anthology, available free with your email sign-up

Nakamura Detective Agency · Book 1

A Kansai Mystery
All books on Kindle Unlimited
Send to E-Reader and Enjoy!

Neon lights, a cold case...and a colder truth

Kyoko Nakamura didn't leave the police force to babysit cheating spouses and run background checks—but that's the reality of private investigation in Japan, and it's what pays the bills at the small agency she runs out of a cramped sixth-floor office in Osaka's Namba district. No dramatic shootouts, no Hollywood theatrics. Just patience, cigarettes, and knowing how to read people.

Then a grieving couple walks through her door with a case that doesn't fit the mold.

Their daughter, Akane Suzuki, was once a rising idol, adored by fans across Japan—until a scandal ended her career and sent her spiraling into obscurity. When she's found dead after a fall from her apartment balcony, the police rule it a suicide and move on. Her parents refuse to accept it, and a tip from an old contact on the force convinces Kyoko there might be more to the story.

What begins as a favor becomes Kyoko's most dangerous investigation yet. As she digs into Akane's final weeks, she's pulled into the dark corners of the entertainment industry—an image-obsessed world of has-been stars, ruthless management, and people who know exactly how to make inconvenient truths disappear. The more Kyoko uncovers, the more it's clear that the official story doesn't hold up.

With her instincts as a detective clashing against the ghosts of her time on the force, Kyoko has to decide how far she's willing to go for a case nobody asked her to take—and how much she's willing to risk to get the truth for a family that has nowhere else to turn.

Sharp, atmospheric, and grounded in the neon-lit reality of Osaka's underbelly, Fallen Idol introduces Kyoko Nakamura, a detective as skilled at reading a room as she is at refusing to let a case go. If you like hard-boiled mysteries with a distinct sense of place and a lead character who carries every scene, this is the start of a series worth following. From Percival Constantine, author of the Luther Cross series.

Nakamura Detective Agency · Book 2

A Kansai Mystery
All books on Kindle Unlimited
Send to E-Reader and Enjoy!

The girls walk for money... He walks for the kill

In Osaka's neon-soaked Shinsekai district, men pay to walk the streets with girls dressed as high schoolers—a compensated "date" that's prostitution in every way but name. It's supposed to end with cash changing hands. For one girl, it ends in a cheap hotel room, strangled, with a killer's cryptic mark carved into her palm.

Private investigator Kyoko Nakamura is still riding the wave of notoriety from proving the Akane Suzuki case was murder, not suicide—a win that embarrassed the Osaka Prefectural Police and made her exactly as popular with them as you'd expect. So when Yukari Fukuda, who runs a shelter for runaway girls, comes to Kyoko convinced the police won't lift a finger for another dead "JK" girl, Kyoko can't say no. Not when the victim could have been any of the girls Yukari's spent her life trying to save.

Getting looped into the investigation puts Kyoko against a rising star in the police department who has more ambition than instinct, and would love nothing more than to watch Kyoko fail in public. It also means leaning on her old mentor and the fraying trust between them. And Kyoko must enter places no badge can get her—into the shadows of Shinsekai, where runaways and working girls know better than to talk to cops, but might just talk to her.

But as the body count rises and the killer's marks grow bolder, Kyoko realizes this isn't a crime of opportunity. Someone is hunting girls that the world already stopped protecting—methodically, deliberately, and with a message he's daring someone to decode before he strikes again.

Murder Walk is the pulse-pounding second entry in the Nakamura Detective Agency series. Take a hardboiled dive into Osaka's red-light underworld where justice is scarce, respectability is a luxury few victims are afforded, and Kyoko Nakamura is the only one still willing to look. From Percival Constantine, author of the Luther Cross series.

Nakamura Detective Agency · Book 3

A Kansai Mystery
New Release Released: October 5, 2026
All books on Kindle Unlimited
Send to E-Reader and Enjoy!

An entire town stayed silent—she won't

Sixteen-year-old Shoma Mizuno stepped in front of a train and never looked back. The official verdict: suicide. Case closed. His uncle believes there's more to that story.

Private investigator Kyoko Nakamura built her reputation exposing the truths powerful people want buried. Now Koichi Mizuno is asking her to do it again. Dig into his nephew's death and find out if his suspicions were true—Shoma was bullied, the school knew, and everyone from the principal down chose to look the other way.

The trail leads Kyoko back to Kobashigawa High School—her own alma mater—where the halls are the same but the stakes are far higher than they were when she walked them as a student. Principal Haruki Nishizawa runs the school like a fiefdom, more concerned with his golf game with the mayor than a dead student. And the families who might talk are being quietly pressured into silence.

As Kyoko digs deeper, she uncovers a culture of cruelty that didn't start with Shoma and won't end with him either—one built on cover-ups, intimidation, and a town's unwillingness to ask hard questions. With her own family caught in the crossfire and old wounds from her past reopening at every turn, Kyoko has to decide how far she's willing to go to get justice for a boy nobody protected while he was alive.

Dead Silent is the gripping third installment in the Nakamura Detective Agency series, blending hardboiled investigation with the kind of institutional rot that hides in plain sight. Fans of Percival Constantine's Fallen Idol and Murder Walk will find Kyoko Nakamura at her most personally invested yet — and her most dangerous.