Herz der Dunkelheit.

Janusz disappears during a high school graduation party. Marlin, a classmate, calls the police to report him dead before he himself is run over on a country road. Since evidence suggests a violent crime, Leonie Winkler, Karin Gorniak and their boss Schnabel from the Dresden Criminal Investigation Department begin searching for the student and investigating. His classmates remain silent - no one claims to have seen or heard from Janusz again.