Le Club Rose (Les enquêtes de l'Inspecteur Jackson t. 1)

The environment feels so layered and authentic—I'm curious whether it was based on real places or purely imagined. How did the author approach creating this atmosphere?

Many characters operate in gray areas, which made me question what true innocence or guilt means here. Did the author intend for us to sympathize with any of them?

The pacing kept me on edge, but I also felt connected to the characters’ backstories. I'm curious whether that was planned from the start or evolved during writing.