Against the Rules

Thou shalt not kill.

"Exodus" (King James Version)

It took me longer than I like to admit to realize this cover was an island in the sea.

Oomuro Rie was quite fond of her uncle Shuuzou. Shuuzou started out with great successes on the stock market, and used his fortune to invest in other businesses that only resulted even more money. The small island he owned, was one of the ways in which he managed to use the money he had at his disposal.The island holds a larger two-story house, and five smaller bungalows, and when she was small, Shuuzou would invite her parents and their children to stay there on the island for holiday. The last few years however, she hadn't really seen her uncle, so the news her uncle had died in a traffic accident came as a shock. As he had no other relatives, Rie's father inherited from his older brother, though the size of the inheritance wasn't as big as it once had been. The island was of course also part of the inheritance, but when the president of a small leisure company contacted Rie's father about wanting to buy the island to develop into a resort, her father was quite positive to the offer, as it's kinda inconvenient to own a small island. They agree to have a look at the current state of the island and the buildings there together, as even Shuuzou himself hadn't visited the place the last five years. The president of the leisure company was friends with Shuuzou, and coincidentally, Shuuzou also knew presidents of a real estate agent and constructing company, who also want in on developing this project, so they and their assistants come too. Rie too wants to come along, as this might be the last time she can see the island of her memories, and as she didn't make it into college this year, she still has time now as she studies for her entrance exams. Ultimately, nine people make their way to the small private island, which can only be accessed via a small pier. When they arrive at the island, they find the buildings to be in pretty good shape, but to their surprise, they find that one shack is filled with explosives, hooked up to a system communicating with a smartphone. The bungalows are all locked, but also seem to be holding bombs. It seems someone has been on the island making these bombs for some reason, but because Rie's father can't be sure his brother is not involved at all, he wants to sleep over it one night before they call the police.

The following morning however, one of them is found dead down the cliff of the island, but more importantly, there is a note addressing all surviving eight of them: in it the murderer says they have taken the smartphone that controls the explosives on the island, and that they will detonate the island, killing everyone, unless the rest will follow the ten rules stated in the note. The ten rules range from everyone having to hand in their smartphone and keep them together in a sealed bag to not contacting the police or the outside world, extending their stay to a full three days and most importantly: they are to not even try to figure out who the murderer is, or they will all die. Can the eight survive their stay on this island while following these hard rules in Yuuki Haruo's Jikkai ("The Ten Commandments", 2023)?

Hakobune ("The Ark", 2022) was the first time I ever read anything by Yuuki and it was easily one of my favorite reads of 2023, so when I learned that soon after reading that book, Yuuki released another book with a similar, Bible-inspired title, I of course was more than interested in the book. I wonder what the next book will be! Revelations? The Tower of Babel? Resurrection? The Parting of the Sea? The potential! Besides the title, Jikkai is not connected story-wise to Hakobune by the way, so you can read them in any order.

* September 2024 edit: Okay, so I read Jikkai last year, and also wrote this review then, but I had a long queue of reviews waiting so the post got delayed until today... but earlier this year, I also reviewed Yuuki's (excellent) Salome's Guillotine: I read it soon after its release date, so I decided to push that review up ahead. While that book also has a title from an episode of the Bible, it is in fact part of a different series.

While Jikkai s basically a closed circle mystery in a very familiar form (an island!), the concept of the "ten commandments" laid upon the survivors is interesting, in theory. The final rule, that forbids them from trying to investigate the murder and learn who the murderer is, makes for a catchy marketing slogan, but the rest of the rules are far more practical, like not allowing them to use their phones unless observed by everyone else, or the rule where nobody is allowed to be with someone else for longer than thirty minutes, after which a five minute cooldown period must follow where you need to be alone. It is clear from the way the rules are laid down, the murderer must be one of the surviving eight: the rules only benefit if the murderer is among them, allowing them to control the rest and not have them solve the mystery, without having to reveal to the rest who they are. They also soon realize the murderer has probably set the explosives to go off unless they reset the counter every thirty minutes, meaning the five minute cool-down period is used to reset that counter, making it more difficult for the rest to do anything to counter the murderer. Due to these rules, the first half of the book might feel more like a suspense novel than a detective novel, as obviously, Rie and the other innocent survivors don't dare to do anything that goes against the ten commandments, and so they can't investigate the body or even ask about each other's alibis, something that would usually be done right away in a novel with a similar setting.

To be honest, I was a bit disappointed when the rules were actually introduced, because just based on the marketing slogan, I had expected something else. I guess I had expected something more game-like. The rules are very practical, but at the same time, because we know the murderer has to be one of the eight survivors on the island, they seem a bit inconvenient. How is one person going to keep track of the other seven innocent people on the island as they roam about and occasionally talk with each other? The rules don't forbid that, and it's not like the murderer has tracking tech or anything. Rules like "don't be in each other's vicinity for longer than thirty minutes" make more sense in a setting with more technology present. I was honestly first expecting something more Battle Royale-esque, or something like the Future arc of Danganronpa 3, where everyone had bombs attached to themselves, which would detonate if they violated a personal forbidden rule which was different for everyone. Here many of the rules were just so specific "Place this here, put that away", instead of rules that would be important to remember the whole time, which made the whole concept feel less impressive than it could've been. Ultimately, the only rule that mattered really was the one of not trying to find out who the murderer is, with the rest just being offshoots of that to ensure they wouldn't.

As the survivors wonder why the murderer told them to wait for three days, after which they are allowed to contact the police, the days pass by, but more people are killed. The murderer leaves more notes, telling the others that the new victims were only killed because they violated the rules and that the rest don't need to worry if they obey the rules, but of course, the others aren't really able to enjoy the holiday feeling on the island now. Because they are not allowed to investigate or basically even discuss the deaths, in fear of being bombed, the story offers, ostensibly, only minimal clues to solving the mystery, which is course also what makes the story interesting mystery-wise. That said, it's not like the story is completely devoid of clues, and there are a few things discussed shortly that serve as clues, before they are shut down in fear of the killer, but some notes, like the question why the murderer doesn't just command the others to destroy all clues for the murderer or else they will be blown up, is a very fair one. Of course, a lot of these minor questions would normally be developed more in discussion, but that's not possible here, so the questions linger a bit longer until they are picked up at the end again.

And as a mystery novel that tries to give you very little clues while being fair and giving a justification for why there are so few clues, Jikkai is surprisingly fun. Some things that are done here, were already done in Hakobune and I also think they were done better there, but the type of deductions presented here are still quite enjoyable: as in Hakobune, the deductions revolve around Queen-esque logic, focusing on the state of physical clues and the actions performed by the murderer as seen by the state of the scene of the crime, and there's a segment surrounding foot marks that is very interesting: regarding a late murder, the killer finally does order the rest to erase the tracks left by the murderer on a wet field, but for some reason, the murderer already did that for the victim. Why did they erase the victim's tracks themselves, but didn't erase their own? The deductions here are fun, and certainly also part of what I liked so much abotu Hakobune. In terms of the identity of the murderer, and also the whole motivation for why the murders were committed, and also the (barely existant) backstory to the explosives, I have to admit I felt less convinced. A lot of these aspects are barely justified in the narrative, and you keep wondering whether there wasn't some other way (some less convoluted way) to get things done...

Overall, I think Jikkai is a fun, and exciting mystery novel: it is suspenseful, it is mystery-wise interesting because it actively gives you a reason why there are few clues, and thus also challenging you to get as far as you can with the few clues you do have, but some elements are rather rushed, and ultimately, I think a lot of what Jikkai does, was done better in Hakobune. In fact, I would have totally expected these two books being released in reverse order, as Hakobune feels like the upgraded version of Jikkai. Anyway, I do hope Yuuki will continue with this Bible-themed series, as even if this book wasn't as good as Hakobune (which I thought was exceptionally good), I still had fun with it.

Original Japanese title(s): 夕木春央,『十戒』