Instead, your query most likely refers to one of the following popular German-language or international crime series that often appear in similar search contexts: 1. The "Joe Pickett" Series (Book 17: Vicious Circle)
Because the series pushes the boundaries of standard adult film regulations, it often borders on "taboo" or "extreme" cinema. Distribution is typically restricted to platforms that cater specifically to adult fetishes, and the content is subject to strict age-verification laws in most jurisdictions. Der Sadisten Zirkel 17