The Mansion

Tuesday, September 16, 2025

Accident by Design

Firmitas, utilitas et venustas 
"De architectura"  
 
Firmness, commidity and delight 
"On Architecture"

I wanted to say it'd be cool to have a mystery set in an Escher building, but then I remembered I already read one....

Kenchiku Shizai (2001), which also carries the English title The Builded Dead on the cover, is the 11th winner of the Ayukawa Tetsuya Award and is the "professional" debut of author Monzen Noriyuki, though he had previously self-published a different novel (interestingly enough, that book got a professional release later on). Monzen studied architecture in university, which is all too clear in his debut novel, which originally was sent in to the Ayukawa Tetsuya Award committee under the title The Building That Eats People. The book is narrated by Miyamura Tatsuya, a man in his thirties who's having a long holiday in Nagoya: after attending to a friend's wedding there, he decided to stay at his uncle and aunt's place, which is also an udon restaurant. His cousin Yuuichi is still in high school and (should be) studying for his university entrance exams, which explains why he is still up late at night. One evening, Yuuichi spots a light source moving about on one of the floors of the construction site across the street: a large new building is being erected there, but work has been paused for a few days due to the obon holiday season. His childhood friend Momose, whose father is a subcontractor for the construction site and working in their own workshop to meet a deadline, also sees the light. The two keep an eye on the building, and eventually confide to Tatsuya about the intruder. They decide to sneak inside the construction site to see what's happening. Fortunately, all the foundational work is already done, with the load-bearing walls/support pillars and the stairs finished, allowing them to move about relatively safely. They spot a shadowy figure and chase them into a meeting room on the second floor, but the figure locks the door behind them. Momose is sent to watch the windows outside, while Tatsuya and Yuuichi try to get into the room, which they eventually do by breaking through one of the non-bearing walls. However, they find nobody inside, and the windows are locked from the inside. The trio are puzzled by the disappearance of the figure, and Yuuichi and Momose stay up all night to see if they can spot the figure escaping the site, but it appears the shadow has really just disappeared into thin air.

The following day, they contact Kumote, the on-site supervisor, as he's the only one in authority whom Yuuichi knows the address of, and who hasn't gone somewhere travelling during the holiday season. They have another look in the half-finished building together, while Yuuichi explains what happened the previous night, and suggesting the figure might have hidden themselves inside the walls, but Kumote explains the process of constructing the various walls in the building and how it'd be impossible to either hide into a load-bearing wall, or how they would've instantly spotted someone in one of the non-finished non-bearing walls. The mystery is left unsolved by these men, but then the police becomes involved in a rather surprising manner. The president of the contruction company has gone missing, and the previous day, a cut-off finger had been sent to his home. His secretary is missing too, and one of her body parts was also sent to her home. This also happened to a teacher, who seems to have no connection to the president or the secretary. It also turns out a day worker with no fixed address had sneaked into the construction site on the same night as Yuuichi, Momose and Tatsuya did, hoping to stay in the half-finished building during the holiday, knowing it would be empty. However, he claims he fled the scene when he found three bodies cut up in pieces there, The police suspects those are the bodies of the people they are looking for, but where are the bodies? It seems obvious to assume they are somewhere in the building, but the workers themselves, with their expertise of actually constructing the walls/ceilings/floors seem very sceptical of the possibility of that, as most of the construction involving concrete/mortar was already finished and you'd instantly know if something was 'added' later on. However, when more murders occur at the construction site, it seems clear the building is indeed the crux of this mystery and it is Kumote, with his knowledge of building a house, who tackles this challenge.

A challenge indeed, but not for the reason you might expect at first. The book immediately makes an impression when you open it, as you'll find the volume opens with very detailed floor plans of the five-storey building around which most of the mystery revolves. And while having each floor printed on its own page isn't that uncommon (especially not in Japanese mysteries), the fact each floor is in fact printed on tracing paper is highly unusual! It is here Monzen already shows his familiarity with building design and construction, as tracing paper is used extensively in those fields and it is used here in the book like it is used 'in real life', to show exactly how each of the floors overlap, making you aware of where walls on different floors overlap or not and how corridors/rooms are different between floors. This of course seems to suggest something incredibly clever will be done with this... but I'd say 90% of the justification of this insert, is simply to be authentic, and not per se to faciliate the mystery. Which is a shame, because I was genuinely surprised by these pages when I first opened the book.

In a way, this experience with the very first pages of the book perfectly symbolizes my experience with the whole work. Throughout the book, Monzen really shows he's an expert on the topic of designing and constructing a building and you can feel his enthusiasm throughout the book as he builds the mystery, but it's also his knowledge that really limits the possibilities behind the book. A lot of the mystery revolves around what the murderer did with the three bodies seen by the homeless worker that night: Yuuichi and Momose didn't see anyone carrying three people's worth of body parts out of the building and because the police didn't manage to find the bodies in open spots in the building under construction, the most "mystery-tropey" solution would of course be that the bodies are buried in the walls, but Kumote quickly rejects that possibility by giving lectures on how buildings like these are actually constructed, and with most of the supporting concrete 'parts' of the building set and finished long ago and the non-bearing walls/floors/ceilings simply not lending themselves for hiding spots. Via Kumote, we learn Monzen has obviously given a lot of thought about whether the body-in-the-wall trick could work realistically without anyone noticing, and he gives several detailed reasons why he thinks that's unlikely.

So that leaves the question, where did the bodies in fact go? And how did the dark figure Yuuichi, Momose and Takuya chased, disappear from the locked meeting room? And later in the book, we have another murder on the roof, and all the suspects seem to have a good alibi for this murder, as the time of the crime can be estimated by the fact the murderer left their footprints on a part of the flooring that hadn't set completely yet at that time. While this book thus has as few impossible mysteries (a locked room disappearance even).... I have to admit I basically found all the solutions a bit disappointing. Ironically, this was not because Monzen didn't do his homework on the topic: in fact, it is the exact opposite. He was so thorough in sticking to actual architectural details and realism, the tricks he ends up using just come over as too... plain? While Kenchiku Shizai is definitely a honkaku mystery novel where they talk about locked room mysteries and impossible disappearances and tropes like hiding bodies in the walls, Monzen ends up with far too few options for truly surprising solutions to his own mysteries, and you end up feeling a bit... indifferent to the reveals of what really happened. I can agree his takes would work in real-life at a real construction site, but that doesn't make those solutions really exciting or anything, they just seem like more... realistic and practical versions of tricks I have seen used in more unrealistic, but infinitely more amusing manners, or at least presented with more energy and surprise. I think if you're into architecture, this book can be quite interesting, especially after seeing the more fantastical ways in which buildings are used in Japanese mystery fiction, but for me, it just felt lacking because of the reality.

That said, there are also really brilliant points that help support the mystery. The motive behind the death of one of the victims is really the kind of ideas I love to see in mystery fiction: it strangely fits the realistic angle of Monzen in this book despite also being pretty crazy. The same regarding another late murder: there is a very specific reason for the victim to be found with a knife in his back, which is also brilliantly realistic and at the same time so out-of-there. It's moments like these that really make an impression especially because they make a perversion of the rather realistic look at the construction industry and they really did help elevate my experience with the book.

 On one hand, I can really appreciate the research Monzen poured into this book, and it results in a book that is really educative about how a building is built, knowledge which of course comes in handy in a genre with a lot of quirky buildings with weird gimmicks. But on the other hand, Kenchiku Shizai's main mysteries are all resolved with rather plain solutions because of Monzen is bound by this realism. It's when he dares to go a bit beyond those limits, when the book feels the most memorable. I wouldn't call this book a complete disappointment though. I am aware there are more books with Kumote as the detective (and architecture/building construction as the theme), and I am curious to see what else Monzen can do with his knowledge, so I will probably try more of his books, so I will likely return to him in the future.

Original Japanese title(s): 門前典之『建築屍材』

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