The BBB began serializing MORI Hiroshi's Warawanai sugakusha (Mathematical Goodbye, 1996), third novel in the S&M series, in the summer of 2024 with the complete edition being slated for release in late February, but technical issues with their distribution platform delayed its availability – a minor blessing in disguise. Technically, Mathematical Goodbye is a Christmas mystery. Yes, the middle of summer is still a little early, however, it's slightly more preferable than two months after the Christmas tree was unceremoniously shown the door.
Moe Nishinosono, a sophomore at N University, is invited by a classmate, Kazuki Katayama, to celebrate Christmas with his family at the home of his grandfather, Dr. Shozo Tennoji. The home of Dr. Tennoji, a genius mathematician, is Three Stars Mansion, originally an observatory, comprising of three domes with the planetarium serving as its central hall. It's the interior where the architectural peculiarities of Three Stars Mansion can be found. So, naturally, Sohei Saikawa, associate professor in the Department of Architecture, N University, is interested to come along to meet the famous mathematician and examine Three Stars Mansion in person. Moe, on the other hand, is interested in an unsolved mystery Kazuki told her about. When he was a child, Kazuki witnessed how his grandfather performed a magic trick that's better described as a minor domestic miracle.
Outside the mansion stands a gigantic, ten ton bronze statue of Orion big enough for the children to use the space between its legs as a soccer goal, but somehow, someway, Dr. Tennoji made the statue inexplicably disappear – before making it reappear the following morning. Dr. Tennoji promised "whoever solves this mystery will be the heir apparent to the Tennoji family." But nobody solved it. And the problem remained unsolved for the past twelve years.
So, after everyone arrived, Dr. Tennoji gathered them in the planetarium to greet them. Just not in person, because he's been living alone in the basement of the planetarium for the better part of decade. It's his voice booming from ceiling speakers who greets them. Dr. Tennoji begins the celebrations by giving them a few tough math puzzles, but Moe has a challenge/request for him, "can you make that bronze statue disappear, Doctor?" He reluctantly agrees and, when they go back outside, the statue has disappeared again ("there was nothing but concrete spread out before them"). Wait, there's more. The hermit mathematician has one more riddle for them, "what's the greatest trick in human history?" It's the seemingly disappearance of the statue giving the plot about half of its bulk with the other half coming from its reappearance.
When the Orion statue returns to its original place, it's accompanied by a body lying beneath it and second body found in the first victim's locked bedroom. This double murder, committed in close proximity of place-and time, represents something of a reverse, inside out locked room mystery with the first victim discovered outside the locked mansion with the key to the locked bedroom on their body. Saikawa and Moe have plenty to mull over without additional problems like Moe being shot at in the surrounding forest and discovering a skeleton.
As said before, Mathematical Goodbye is the most orthodox of the three S&M novels translated, so far. So it's obviously not as experimental as Subete ga F ni naru (The Perfect Insider, 1996) nor as densely-plotted, highly specialized locked room puzzle like Tsumetai misshitsu to hakase tachi (Doctors in the Isolated Room, 1996), but astonishingly solvable. I expected my crude, roughly imagined armchair solution for how the statue disappeared, and reappeared, would end up being dismissed as a ridiculous false-solution. It seemed too easy and at the same time too complicated, but that was more, or less, how it was done. So don't be discouraged when Saikawa philosophizes, "this might be a mathematical problem rather than a magic trick." Of course, the problem with vanishing-tricks involving large, hard-to-move or even immovable objects like houses, trains and statues is that there are hard limitations on what you can do – which is why there are so few of them. I wasn't too bothered about the trick, but a little annoyed nobody thought of (ROT13) fvzcyl gnxvat n fgebyy nebhaq gur cerzvfr gb frr vs vg unq orra zbirq nebhaq gur cynpr, because that's what I would have done if I found myself in such a situation (yay, I'm the world's greatest detective!).
The solution to the double murder is much more interesting and tricky, but not exactly a classically-styled locked room mystery. It's not so much about how the doors and windows were locked and closed, but why there were locked and closed. This is demonstrated when Moe gives, what appears to be, a perfectly reasonable (armchair) solution accounting for every aspect of the murders. Saikawa points out it only work if the murderer had a reason for the bedroom to be locked. Or why the murderer decided to suddenly improvise by using a vase as a weapon. So it's more along the lines of those double murders closely linked in time-and place I have come to associate with Christopher Bush's 1930s novels (e.g. The Case of the Tudor Queen, 1938) rather than a proper locked room mystery, but gave the plot some much needed weight. It's the real meat of the plot even if the who and especially the why are a trifle weak.
Mathematical Goodbye appears on the surface to be another, Yukito Ayatsuji-like "weird house" shin honkaku locked room mystery and, plot-wise, a fairly average one at that, but it's a little more than that. What really lifts up the up book, as a whole, is the theme of inversion running through every aspect of the story, from the setting and vanishing statue to the murders. Hiroshi takes the concept "not everything is as it appears" or "more than meets the eye" as used in the detective story and pulled it inside out and back together again, which created some pleasing plot patterns to ripple through the story. That made up for what it lacked in expected plot complexity/ingenuity. So, Mathematical Goodbye is perhaps not the strongest entry, plot-wise, in the S&M series, but by itself, it's a pretty solid piece of detective fiction trying to do something pleasingly different with tried and tested recipe from the first wave of shin honkaku mystery writers. If you're looking for something a little off-beat for your December reading, you can take this as an early recommendation.
A few odds and ends: Ryusui Seiryoin is improving as a translator as the translation of Mathematical Goodbye is much smoother compared to the clunky translation of The Perfect Insider, but wish the BBB would translate one of Seiryoin's own mystery novels like Kazumikku: sekimatsu tantei shinwa (Cosmic: End of Century Detective Myth, 1996). Who here wouldn't want to read an impossible crime with a figure called The Locked Room Lord threatening 1200 people would die in as many locked rooms. In the mean time, the BBB and Seiryoin are working on the translation of the fourth S&M novel, Shiteki shiteki Jack (Jack the Poetical Private, 1997), in which a serial killer is working the college circuit. Lastly, I don't know how it could be done or who should do it, but a crossover between Hiroshi's Saikawa and Moe and Sou Touma and Kana Mizuhara from Motohiro Katou's Q.E.D. series needs to happen. They already feel like they could take place in the same universe and a crossover between the two has all the potential to be the perfect crossover. Yeah, not likely to happen, but it would be great.
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