I really liked ネタバレあり! I did find some parts in the first half a bit long, but it all pays off in the end. It’s the kind of novel where everything makes sense and everything had its purpose.
To be honest, I have been tired of contemporary Japanese honkaku mysteries lately. I find that they tend to be too meta, too clever, too focused on tricks and how to deceive the reader, and not enough on the characters and the actual plot. The novel itself sometimes becomes a part of the plot, you have mandatory characters like the detective and the author of detective novels, and characters will discuss detective fiction, but in the end, it’s always the same things again and again.
This novel is also no exception, but it’s really well executed, and it renewed my love for the genre. Characters are well written and their personality and motivation are not sacrificed to the tricks. The way the novel is integrated in the story is very well done and doesn’t feel artificial at all. The solution was also very good, and the end really engrossing.
ネタバレあり―双紋島の殺人
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I can’t believe I finished it today!! I devoured the second half!
At some point, there is a shift in the novel, and I thought I would stop there, but I got curious and started the next part. It was so engrossing, I just continued reading until I finished it! The end was truly excellent.
I haven’t been able to read for long periods of time lately, I get tired after 10 or 20 pages, so I’m very happy with my progress today! To be fair, Japanese is the easiest language to me, and this book is also easy to read.
Made some progress today. It’s funny that there’s a storm in the novel, and we have heavy rain here irl.
The story took an unexpected turn to say the least!
I finished the second section, and I guess we met all the characters now!
I made some progress today, I’m still at the beginning, but I really really love it so far 
I just read the first part, and this novel really feels different! Not just because it starts with a list of spoilers, but because of the way it’s written. I really love it. The opening scene of the novel is such a classic one, I’ve read so many openings like this one, but it also feels very different too, and even though the book has just begun, I feel like I’m already in the middle of the mystery. It’s very intriguing.
Not only that, but the writing is great too, just a few pages, and I already feel like I know the characters well, I really liked how they were introduced.
I wish I wasn’t so tired, but I don’t think I can get more reading done today…
Anyway, I’m very glad I chose this book, the beginning is very promising!
I’m starting ネタバレあり today 
It’s the first time I’m reading Atsushi Shimomura, but if I like this one, I’ll read other books by this author.
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とはいえーー吹雪や嵐に閉ざされた孤島や館を舞台にしたクローズドサークルで、誰一人犠牲者が出ないとなると、盛り上がりに欠けることは否めません
— Mikumo Kyōma
ミステリーの舞台としてはおあつらえ向きですね。何しろ、いわくつきの孤島ですから
— 三雲梟馬