This is not only the worst book I've read this year: this is the worst book I've read in the last ten years at the very least. Now, this will obviously contain spoilers, but for what it's worth, I honestly think it's better to read the spoilers now and be done with it than waste time on the actual book itself. Even apart from the crime plot, it's written like a not very good light novel - in fact, I have translated shounen mangas that were much better written than that. But on to the spoilers! One, it is often said that the Golden Age crime fiction has little focus on the psychological aspect of the story. I've always felt that this is a somewhat unfair view. In any case, most writers of this period were able to write stories in which all events were largely psychologically probable, that is, you had no trouble believing that the murderers had reasons to murder - even when from your own point of view things such as reputation are hardly worth the hassle of a murder or two. Hayasaka belongs to a sort of post-post-Golden Age genre of crime writing, which is why this is relevant at all, and his main problem is that he is apparently completely unable to write characters with believable motivations: when I reached the point in the story where a doctor decided to kill an acquaintance who vaguely ressembled him because he found himself (doctor, not acquaintance) follow by yakuza when he'd botched an operation on a penis of a prominent member's son, I mostly just wanted to laugh. In fact, I still do. But of course one has very few expactations for an author for whom the height of characterisation, and I use the term very loosely, is having a character call a woman "bitch" instead of "she" to show how manly he is. The second issue: the entire murder and in fact the entire mystery hinges on the author's flawed (this is a very charitable description, I feel) knowledge of human anatomy. This is how it goes: the characters are nudists, and thus would have nowhere to hide a weapon, apart in their vagina or in their anus. Now, the weapon is an ice-pick and quite honestly, I feel that persons dumb enough to stick dangerously pointy objects inside their rather delicate and softer body parts have no business committing murder in books, and I will stand by it. But the author insists that inserting an ice-pick into your anus or vagina would be easy enough to prove hours and hours later, because it would make both anus and the vagina looser. Oh lord! The book was originally written in 2014, and even if Hayasaka had no reliable sex education in school, he could have Googled it instead of relying on dumb, pseudoscientific drivel. He could have experimented, if he really was this curious, although again, I do not recommend inserting sharp and pointy objects into your anus/vagina for obvious reasons. I was hoping for low-quality entertainment, instead I was hit full on the face with stupidity and ignorance of a kind that simply beggars belief. Don't do this to yourself, absolutely do not ever read this book. There are others.