Book: 変な家 | L30 (Probably closer to L28)
Is there an ebook available?: yes
Is there an audiobook available?: yes 
Summary - Japanese
謎の空間、二重扉、窓のない子供部屋----
間取りの謎をたどった先に見た、
「事実」とは!?
知人が購入を検討している都内の中古一軒家。
開放的で明るい内装の、ごくありふれた物件に思えたが、
間取り図に「謎の空間」が存在していた。
知り合いの設計士にその間取り図を見せると、
この家は、そこかしこに「奇妙な違和感」が
存在すると言う。
間取りの謎をたどった先に見たものとは…。
不可解な間取りの真相は!?
突如消えた「元住人」は一体何者!?
本書で全ての謎が解き明かされる！
Summary - English
Mysterious space, double doors, windowless children’s room: ----
What is the “fact” that I saw when I followed the mystery of the floor plan?
What is the “fact”?
An acquaintance of mine is considering purchasing a second-hand house in Tokyo.
It seemed to be an ordinary house with an open and bright interior, but the floor plan showed a "mysterious space.
However, there was a “mysterious space” in the floor plan.
When he showed the floor plan to an architect he knew, he was surprised to find that the house had “strange spaces” all over the place.
He said that the house had “strange and uncomfortable” spaces here and there.
I showed the floor plan to an architect I knew.
What did he see when he followed the mystery of the floor plan? …
What is the truth behind the puzzling floor plan?
Who is the “former resident” who suddenly disappeared?
All mysteries will be revealed in this book!
Content warnings if known
殺人, カルト
