noun
The Decagon House Murders
Title of a 1987 mystery novel by Yukito Ayatsuji; a well-known work in Japanese honkaku mystery.
「十角館の殺人」は綾辻行人のデビュー作です。
"The Decagon House Murders" is Yukito Ayatsuji's debut work.
Compound of 十角館 (じゅっかくかん, "decagon house") + の (possessive particle) + 殺人 (さつじん, "murder"). The title refers to the setting of the novel.