Brief Einer Toten (Detective Inspector Declan Walsh Krimi 1)

The concept of a haunting letter as a catalyst felt fresh, but I'm curious whether it was inspired by real cases or pure fiction. How did the author decide to use this device?

The story seemed to take a slight breather before ramping up again. Was this intentional to build suspense or character depth?

The dual viewpoints created a layered experience, but I wonder if this structure was planned from the start or evolved during writing.