Panic on Gull Island

Open here I flung the shutter, when, with many a flirt and flutter,

In there stepped a stately Raven of the saintly days of yore;

    Not the least obeisance made he; not a minute stopped or stayed he;

    But, with mien of lord or lady, perched above my chamber door—

Perched upon a bust of Pallas just above my chamber door—

            Perched, and sat, and nothing more.
"The Raven"

Suddenly craving fried chicken...

Iwaido Yasumi is a student at Teiou University who hopes to impress his lecturer Uehara Kanon, a beautiful, cool-headed woman who teaches his cultural anthropology class. He ends up writing a paper that is actually quite impressive, so much so she summons him to her office. Not because she's become romantically interested in him, but to make sure he didn't plagiarize his essay. While Yasumi tries more than once to woe Kanon, she brushes his advances and informs him that Professor Kirimura Satoru, the most influential professor at their faculty, has also read his thesis and has ordered Yasumi to be added to an upcoming fieldwork trip. Kirimura will lead a team, including Kanon and Yasumi, to Torikui Island, a solitary island that is technically part of Japan, but which has been deemed "off-limits" for decades. Centuries ago, it was used as an island to send sentenced criminals to, even though there were indigenous inhabitants too, and with time, a unique culture developed, seperating the island in two distinct clans, one of the indigenous people and one of the descendents of the sentenced criminals. The main staple food on the island is surprisingly not fish, but birds of prey, and the two clans are named after their preferred food: the Eagle clan and the Raven clan. Because sentenced criminals were usually branded by having a part of their body mutilated, the people on the island also developed a unique sense of "beauty": when an islander becomes an adult, a part of their body is amputated to mark them as as a full adult person: the Eagle clan people mutilate their face (eyes or ears removed), while the Raven have limbs removed. Long ago, a person rumored to be related to a very important and esteemed bloodline was banished to the island and this Man in the Iron Mask-esque figure became feared and respected as a living god on the island named the Bird Demon. Because of their bloodline, the Japanese authorities also occasionally sent supplies to the island to ensure the people there could live, despite it being completely cut off from the rest of Japan and it was forbidden for people from the mainland to go to Torikui Island, or vice-versa. Some decades ago, Takaoka Jinichi, professor at Teiou University, stayed for months at the island to do research on the local culture, and it is the only source of information on the island.

Kirimura Satoru, who studied under Takaoka, also visited the island in the past, but now returns for a new research trip, because recently, Inou Nao, the young daughter of the island's only doctor, escaped the island in search for help. Inou Kaoruko hails from the mainland, but was stationed at the island to serve as the only medical expert. Nao was raised on the island, but has now violated the island rules to look for help: she claims that the last few years, the peace on the island has been visibly crumbling apart: there are only about thirty people left on the island, with few children, and both the Eagle and Raven clans are on the way to extinction. This has caused a very strong rift between the two clans, and it could go wrong anytime. While usually, the Japanese authorities does not allow for visits to Torikui Island, Kanon reveals to Yasumi there's a hidden agenda to their research: the government wants to use Torikui Island as an experiment to see how people will act in a declining society that is on the verge of falling apart. 

To Yasumi's big disappointment, he learns on the day they are travelling to the island that Kanon isn't allowed to go, because Kirimura Satoru deems her an academic rival and doesn't want her around. Other people in the team however include Kirimura's half-sister (an academic too), a researcher attached to the university and two government "observers". Nao is also brought along, though in disguise, because she violated the local rules. When they arrive at the island by yacht, they are "welcomed" by the Eagle clan, though some of them seem to blame Kirimura for the fall of the island, as everything started to slowly crumble after his visit many years ago. They learn the Bird Demon has disappeared from the island, and because this figure of authority is gone, the rivalry between the Eagle and Raven clans has only worsened. In fact, the two clans are so against each other the houses on the island are in fact built to alternate between a house of the Eagle and Raven clan, so they can all keep an eye on each other like a panopticon. The fieldwork team settles for the night, but Kirimura goes out for a stroll, while Yasumi calls Kanon to report on the on-goings on the island. When Yasumi remembers he left his phone charger in the boat, he returns to the beach to the yacht, but he finds Nao stabbed to dead on the beach. But for some reason, only Nao's own footprints are found in the sand, and there are no signs of footprints left by her killer. At that same moment, he receives a message from Kirimura Misaki, who summons the rest of the team to her, because she found her own brother murdered. These two deaths however are just the starting sign for a full breakdown of Torikui Island in Mori Akimaro's Setsudantou no Satsuriku Riron (2024), or as the cover also says: The Genocide Theories in the Mutilation Island.

This was definitely a book I picked because of the crazy premise and alluring title: an island where people willing mutilate themselves because they think it's beautiful? A closed circle mystery set inn isolated and small society doomed to fail and end in genocide? I had never read anything by Mori Akimaro before, but this description really sounded alluring to me, especially with its focus on anthropology.

Once I got started reading however, it did take me a lot of time to get used to the protagonist, and even at the end, I never learned to like him. He's constantly trying to be witty and hitting on Kanon, his lecturer, and after a while it really got old. There's some mystery revolving around how he wrote his essay even though he himself even admits he doesn't quite understand how he could've written such an impressive work, but that is hardly fairly clewed: while it has huge implications for him, it's not really that well integrated with the main mystery of the murders that occur on the island, and it felt like two completely different ideas that don't work together. But add to that the fact he's really obnoxious every time he talks to Kanon (he's constantly keeping her up-to-date on what has happened on the island), and it's really a shame he's the character we're constantly following in this narrative...

Once we arrive on the island however, we do get the highlight of the book: Torikui Island, its inhabitants and the unique culture they have. Mori does a great job at setting the scene and explaining how the people on the island developed their own cultures, based on their food culture (eating predatory birds, as you obviously can't have cattle on a small island like that) and the fact most of them are descended in some way from mutilated criminals, giving them a warped sense of beauty: all the adults miss a body part, and the children aren't seen as full humans because they still have all their body parts. The rivalry between the clans creates the unique situation where the houses are laid out like a panopticon around the main square, and so you instantly get a kind of impossible crime set-up, because everyone is watching each other. That is how the book also initially sets things up, as while Kirimura Satoru and Nao end up dead, the islanders are quite sure none of them are the murderer, and are more suspicious of the fieldwork team members. We also have the wildcard Kaoruko, the mother of Nao, who does live on the island, but has never been fully accepted by either clan. While we initially are 'treated' to the double murder of Kirimura and Nao, we soon see the native inhabitants be killed too in all kinds of manners: while these situations are seldom 'impossible' or pure mysteries on their own (i.e. killed in a way anyone could've done it), that doesn't make their deaths less interesting: the slow downfall of the island society is truly a sight to behold, and at the same time, Mori manages to use the very unique island culture to create a few very ingenous and crafty situations that could only occur here. The use of anthropology to create tricks in mystery is something I very much like (see for example the use of religious concepts to create mysteries in the Toujou Genya series), and The Genocide Theories in the Mutilation Island very much succeeds in that aspect: a lot happens in this book, and surprisingly enough, those happenings could really only happen here, because this is such a weird place, and some of the mysteries the reader will be treated to, are extremely memorable cause of that. And when Yasumi isn't trying to interrupt the discussions by hitting on Kanon, there are actually quite interesting musings on anthropological topics that pertain to this novel, from the consumption of birds to views on beauty etc.

But there is a caveat. A pretty big one too. Don't be reading this for the impossible crimes. There are a few impossible situations, from the no-footprints-in-the-sand situation at the beginning, to Kirimura also being killed in a place that was basically observed, but the solution to these mysteries is really outrageous. I guess you could say it was hinted at, but not in a sane manner, and nothing about the story leading up to the reveal seemed to even suggest this would be such an insane mystery novel, so to me, it really felt like it came out of nowhere. I loved the way Torikui Island was developed as a very strange, yet weirdly convincing place, but Mori certainly didn't manage to pull the same thing off in regards to his impossible crimes in this novel. In a way, this could be seen as a 'so-silly-it's-brilliant' type of explanation, but I find the juxtaposition with the more serious depiction of the island's culture from an anthropological POV not smooth, though your mileage may vary there.

So in the end, I do think Setsudantou no Satsuriku Riron is a really cool mystery novel, with an absolutely banger of a setting which is used in clever ways for some of the mysteries, but I wouldn't be reading this solely for the impossible crimes, and you do need to be aware it's a bit weird when it comes to the solution, despite the rather heavy themes of the events on the island. Still, a very memorable novel which I am likely not going to forget soon.

Original Japanese title(s):  森晶麿『切断島の殺戮理論』