十角館の殺人 (Jukkakukan no satsujin; The Decagon House Murders) by 綾辻行人 (Ayatsuji Yukito)
Much mystery. Very suspense.
(Didn't get too much out of it apart from that, but for most die-hard fans of the genre it will probably do the trick.)
⭐⭐✨☆☆ (2,5/5)
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