Jan Olsson, born 1936, is a retired Swedish criminal inspector and author.
He has worked on many of the most talked about cases in Swedish criminal history, such as the Norrmalmstorg drama, the Bombman, the Laserman, Thomas Quick and Norbert Kröcher.
Margit Norell - the woman behind the serial killer that was not there. She was a psychotherapist at Säters psychiatric clinic and supervised the psychologists and therapists in the 1990s treatment of Thomas Quick. The treatment method, based on object relations theory, focused on the development of repressed childhood memories with psychotherapy. In the case Thomas Quick argued that abuse in childhood meant that he started murdering people in adulthood. Whereupon Quick admitted one murder after another, and finally was convicted of eight murders.
During the 1990s, Thomas Quick confessed to one unsolved murder after another, becoming, in the words of the father of one of his alleged victims, "a ghost who ran through Scandinavia killing more than 30 people".