Salaperäinen vihollinen: Kertomus salapoliisi Asbjörn Kragin elämästä

The narrative centers on detective Asbjörn Krag investigating an apparently deliberate wound to an elderly household head after unsettling changes in behavior and a young woman's romantic involvement. The inquiry gathers testimonies, contradictory clues, nocturnal encounters, and tangible evidence such as a shattered window and a distinctive blue envelope, moving through false leads and shifting suspicions to the revelation of a new killer. By methodical questioning and assembling a chain of small details, the investigator exposes hidden motives and connections, and the case culminates in a decisive turn that brings retribution and resolves earlier mysteries.