Disclaimer: I read this in Japanese. This is probably the second Onda book I read. I heard about this book on The Next Chapter and had to immediately download the Japanese version. I read it in one day. Super mysterious and intriguing. I had a hunch I probably won't find out who the murderer was. I won't say I was right or not. I also thought it was a shame as I'm sure some parts of the Japanese original version won't translate into English, such as Kanji spelling of character names. I'd be curious to pick up the English version just to see how it's done.
Really intriguing, mysterious, fast read. I enjoyed it.