Mystères à chaque étage

The concept of a mysterious, multi-layered building is so imaginative. I wonder if the author drew from real places or just let creativity run wild.

The characters felt so lively and distinct—amazing how they brought the story to life. Did the author spend a lot of time developing each one?

The story moved along at a fun pace without rushing through the moments that matter. I’m curious if structuring it this way was planned from the start.