20年目のクラスメート (Paperback Bunko)

The suspense builds so naturally throughout the story. I'm curious if there were specific techniques or inspirations behind creating this feeling.

The clues were subtle but cleverly placed, making it hard to settle on just one suspect. Was this intentional to keep readers on their toes?

The nighttime backdrop feels so integral to the story’s tension. I wonder if the setting was based on a real place or a specific mood the author wanted to evoke.