Blutiger Ball am Berkeley Square

The depiction of Regency-era society added depth, but I'm curious whether this was based on historical research or creative choice. Did it influence the plot more than I realized?

The story seemed to take its time revealing clues, which made the tension build beautifully. I'm wondering if this was intentional or if I was just eager to find out who did it.

The location felt so vivid and atmospheric—was the setting chosen for its historical significance, or did it come from the author's personal interest in that area?