A fatal incident occurs during a workshop that Inspector Borowski and his colleague Mila Sahin are holding at a police academy. Completely unpredictably, during a practical exercise, police student Nasrin stabs her classmate and casual acquaintance Sandro. He succumbs to his injuries a little later. The case caused public outrage. Questions about the reasons for her actions bounce off Nasrin Erkmen - she can't remember anything. For Tobias Engel, Nasrin's friend and also a participant in the workshop, a world collapses. During the investigation, Borowski and Sahin come across the case of Jule: shortly before the crime, the young woman had thrown herself off a high-rise building in front of Tobias' eyes - and was close friends with Nasrin...