Wiesbaden is in shock. One morning suddenly shots rang out in a high school. The inspectors Winnie Heller and Hendrik Verhoeven find three bodies in the school. The principal and two students are dead. And there is no trace of the perpetrator. However, one suspect is quickly identified: the 17-year-old problem student Nikolas Hrubesch, who was recently expelled from school and is now nowhere to be found. When the investigators look around Nikolas ’parents' house, there are several indications that the student, humiliated by his classmates, was planning a rampage. To Winnie Heller's colleagues and the public, the case seems clear. But while the large manhunt for Nikolas Hrubesch is underway, Commissioner Winnie Heller has more and more doubts about the hastily formulated killing theory. In order to uncover the truth, Winnie Heller has to reconstruct the exact course of events. In doing so, she herself is in mortal danger and comes dangerously close to the perpetrator. (Text: ZDF) (thetvdb.com)