毒薬 (ハヤカワ・ミステリ文庫―87分署シリーズ)

The setting adds layers of tension and atmosphere to the story. I'm curious whether this was based on a real place or purely fictional.

The story seemed to take a breather before the climax, which made me wonder if that was a deliberate choice to deepen character development.

His personality and methods felt so authentic — I wonder what inspired his background and motivations.