In 2021, John Pugmire's Locked Room International published Masahiro Imamura's Shijinso no satsujin (Death Among the Undead, 2017), translated by Ho-Ling Wong, which at the time made "enormous waves in the world of Japanese mystery fiction" not seen since the debuts of Soji Shimada and Yukito Ayatsuji – not without reason. Imamura's Death Among the Undead placed your typical, traditionally-plotted shin honkaku mystery in the middle of a zombie outbreak! Don't mistake it for a gimmick or novelty mystery. Imamura masterfully demonstrated fantastical elements can be inserted into the traditional, fair play detective story without ruining either. In fact, when handled correctly, it opens doors and unlocks new possibilities previously inaccessible to the normally grounded detective story.
Imamura's Death Among the Undead signaled a change and seems like the hybrid mystery's time has finally arrive, because it has been tried before. But never took root.Edgar Allan Poe's "The Murders in the Rue Morgue" (1841) is not only the first (modern-ish) detective story and locked room mystery, but also the first mystery-horror hybrid on account of the solution. Another early example is Fitz-James O'Brien's "The Diamond Lens" (1858) blending mystery with fantasy. There are a few pre-Asimov attempts at science-fiction mysteries, but the only noteworthy example is Manly Wade Wellman's Devil's Planet (1942). David V. Reed's Murder in Space (1944) is irredeemably bad, while John Russell Fearn's The Master Must Die (1953) and The Lonely Astronomer (1954) are hampered by one of the most irritating detective characters ever created. They all offer an unimaginative, poverty stricken vision of the future with clunky robots and snail mail between planets. There is, of course, Randall Garrett's Too Many Magicians (1966), a fantasy mystery, but, as you probably know, I'm famously not a fan of it.
So beside a couple of noteworthy titles, even a few first-rate examples from Japan, the hybrid mystery didn't take off, until Imamura's Death Among the Undead. The translation also made the hybrid mystery a subject of interest around these parts of the mystery fandom and got bitten myself by the hybrid mystery bug, which could have been as serious as my locked room obsession saved only by a lack of material, not for a lack of trying! I have gone through enough hybrid mysteries now to compile a top 10 and there were enough good titles that some had to be left on the cutting room floor. I also left out a couple of titles, because I didn't want it seven or eight of the titles to be Japanese translations. For example, I left Imamura's Death Among the Undead off the list as it already made "Top 10 Best Translations & Reprints from Locked Room International" and have another zombie mystery to take its spot on this filler-post list. So along with future releases, there's more than enough left for a part two, if anyone's interested after this one. Let me know down below.
The Julius Caesar Murder Case (1935) by Wallace Irwin
In 1935, The Julius Caesar Murder Case was little more than an amusing curiosity, a cross between historical fiction and a pulp-style mystery, because historical mysteries didn't exist back then. Wallace Irwin is credited with writing one of the first "toga mysteries," but the book is essentially a parody of a genre that had yet to be born. The book is hilarious, written in the style of the pulps, following the star reporter of the Evening Tiber, Publius Manlius "Mannie" Scribo, who gets involved in the most notorious murder case of ancient Rome. If you love historical mysteries and have sense of humor, Irwin wrote The Julius Caesar Murder Case for you.
The Caves of Steel (1953/54) by Isaac Asimov
Considered by many to be the OG hybrid novel. At least, the first truly successful one as Asimov penned a triple masterpiece of detective fiction, science-fiction and dystopian rolled up into one classic – maybe one of the best post-Golden Age mysteries from the previous century. Most importantly, The Caves of Steel demolished the argument that advancements in science and technology made the traditional detective story obsolete before it was put forward. Asimov wrote a pure whodunit in a world full with AI robots, mind probes and space-faring breakaway civilizations. So its only shortcoming is not becoming a trendsetter that launched the hybrid mystery as a legitimate subgenre or off-shoot back in the '50s.
"The Closed Door" (1953) by Kendell Foster Crossen
The only short story on the list and a short story that should have been a novel-length mystery, because the premise and solution is brilliant. A story taking place on a space hotel constructed out of hundreds of different type of plastics to accommodate every life form in our galaxy. A murder of silicon-based alien is murdered inside a locked room during a galactic conference with the solution making almost perfect use of its future backdrop, which could have been the equal of Asimov's The Case of Steel had been a novella or novel-length. So had to include on the list.
Inherit the Stars (1977) by James P. Hogan
Technically, Hogan's Inherit the Stars is a pure science-fiction novel, not a hybrid mystery, but the book secured a high-ranking spot on Tozai Mystery Best 100 and Ho-Ling posted a fascinating review on his blog – which caught the attention of our corner of the genre. What we found was a detective story on a celestial scale, presented as pure science-fiction, but the answer how a skeleton in a space suit ended up being buried on the moon thousands of years ago is a tour de force. I expected time travel shenanigans or a cross between the Piltdown hoax and the stories of lost Soviet cosmonauts, but never imagined anything like that. We have since appropriated Hogan's Inherit the Stars from the science genre. It's ours now!
Ikeru shikabane no shi (Death of the Living Dead, 1989) by Yamaguchi Masaya
This zombie mystery predates Imamura's Death Among the Undead by nearly three decades, however, Death of the Living Dead is an entirely different kind of zombie mystery. The zombies here aren't mindless ghouls hunting in packs, snack attacking everything that moves, because they're still in full possession of the personality and mental capacities. So they're literally the living dead and placing them in a traditional detective story places a completely new complexities on the Golden Age-style mystery with a great detective and cast of characters. Masaya's Death of the Living Dead probably is, conceptually, even better than Imamura's take on the zombie mystery and a genuine classic of the horror-mystery hybrid. It's a shame it's English debut was largely ignored to the point where the publisher gave up on future translations.
Nanakai shinda otoko (The Man Who Died Seven Times, 1995) by Yasuhiko Nishizawa
The most recent translation on this list merges the detective story with the time loop dodge involving a high school student, Kyutaro, who regularly finds himself stuck in eight day time loops. Great when you need to ace a school exam, but not so much when a murder crops up during a loop. Even less so when the murder involves members of his own family! Like I said in my original review, if The Man Who Died Seven Times is not perfect, it's close enough.
By the way, I think the time loop device works really well when paired with the detective story, because it's basically the dueling/multiple narrative device on steroids. Yukito Ayatsuji could probably write one hell of a time loop mystery!
The Ripper of Storyville and Other Ben Snow Tales (1997) by Edward D. Hoch
A western mystery is probably not the first thing that comes to mind when thinking of hybrid mysteries. Nothing more than a change of scenery and time period, historical mysteries than genre crossovers, but westerns are a genre with a Golden Age of its own – mixing westerns with mysteries counts in my book. Nobody did the western-mystery better than Edward D. Hoch in his long-running series of short stories about his gunslinging detective, Ben Snow, who has an uncanny resemblance to Billy the Kid. The Ripper of Storyville is a first-rate collection of short stories and probably the best Hoch collection published by Crippen & Landru without a single bad story. Maybe we'll finally get a second Ben Snow collection in 2027 to mark the 30th anniversary of the first collection. Fingers crossed!
Rurijou satsujin jiken (The "Lapis Lazuli" Castle Murders, 2002) by Takekuni Kitayama
Another early, Japanese experiment predating Imamura and not easily pigeonholed or briefly summarized. It can be described as an unadulterated flight of fancy in which cursed daggers bind the main characters together through a never-ending cycle of death and rebirth stretching from 13th century France and trenches of the First World War to a library in 1980s Japan. A hybrid mystery that has to be read to be believed and that goes double for the locked room mystery in the Library at the End of the World!
Jikuu ryokousha no sunadokai (The Time Traveler's Hourglass, 2019) by Kie Houjou
I could have picked any of the three novels in Houjou's "Ryuuzen Clan" series for this list, because they're modern masterpieces and future classics. So why not go with the first one in the series? Like the title suggests, The Time Traveler's Hourglass involves time travel as Kamo Touma, a magazine writer, gets an opportunity to go back to the 1960s to prevent a tragedy that destroyed his wife's family. The plot is as sound a piece of craftsmanship as we come to expect from the Japanese shin honkaku writers, but what sets The Time Traveler's Hourglass apart is the heart and humanity underneath it all. To quote Mitsuda Madoy, "Houjou may write with the laser focus of a true Kyoto U. Mystery Club graduate, but there's a heart to her characters that I rare see even in non-mystery writers." It's time this series gets an official translation/release.
Black Lake Manor (2022) by Guy Morpuss
So, as you can see, the Japanese have already terribly spoiled me with their third wave shin honkaku hybrid mysteries, as well as some of its precursors, which is why I approached Black Lake Manor with skepticism and lowered expectations – considering the stiff competition it was up against. Morpuss and Black Lake Manor proved to be worthy competition to their Japanese counterparts. A web-like plot casually toying around with various timelines, time resets and hard light technology without the plot or story getting muddled. It's therefore unfortunate Morpuss is only interested at the moment in writing standalones and unlikely to return to this fascinating world he created anytime soon.
Like I stated, there's more than enough left to compile another list, but should note that not every hybrid mystery reviewed has been a success story. On the contrary!
For example, Asimov's series of short stories featuring Wendell Urth has a fantastic premise: an earthbound extraterrologist and armchair detective who uses Earth as the biggest, most comfortable armchair in our Solar System to ponder the mysteries of the universe – criminal or otherwise. Regrettably, the stories betrayed Asimov had been unable to mine the series full potential. Only the second story, "The Talking Stone" (1955), is any good. Ross Rocklynne and Arthur Jean Cox's The Asteroid Murder Case (1970/2011) has a razor thin plot ruining a genuinely original motive. Lawrence Block's The Burglar Who Met Fredric Brown (2022) is a very entertaining fan pleaser, but the parallel universe angle is only there to have some fun with the main characters. André Bjerke's De dødes tjern (The Lake of the Dead, 1942) and Natsuhiko Kyogoku's Ubume no natsu (The Summer of the Ubume, 1994) blending of mystery, horror, folklore and the occult failed to capture my imagination.
Nevertheless, after several years of rooting around for these once too often dismissed hybrid mysteries, especially the Japanese variant, gave me a vision of the detective story's potential future. The hybrid mystery, a good, well-done hybrid mystery, simply offers too many new possibilities to the write and plot new, fresh and original detective fiction to leave it at the wayside again. They're also an open invitation to new or even outside talent. So can see the hybrid mystery following a similar trajectory as the historical mystery and police procedural in becoming an off-shoot/subgenre of its own. At least in Japan. But, if it catches on over here, I can see the hybrid becoming one of two dominant forms in our traditionalist corner of the genre in the decades ahead. The other being historical mysteries with a Golden Age or 20th century setting.

Thanks for sharing this. The Julius Caesar Murder seems very interesting. Would love to see a second list.
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