The book is based on a dramatic event in Bergen Norway, where a body of a young woman was found on the 29th of November 1970 under suspicious circumstances in the valley Isdalen Valley just outside of Bergen city center. Since then the case has had a large media and public interest and has been published in Norwegian and international media and is known as the Isdal case or the case of the Isdal woman.
https://www.amazon.com/Isdal-Woman-Operation-Isotopsy-Valley/dp/1719825211