Nancy Drew 28: the Clue of the Black Keys

Her cleverness and independence felt so empowering for middle-grade readers. I wonder if the author based her on anyone or if she was entirely fictional from the start.

The story took a bit of a breather before picking up again. Was this intentional to build suspense, or just a natural part of the mystery?

The cozy yet secretive atmosphere really added to the story. I'm curious whether the author drew from real places or imagined it entirely.