Inspectors Charlotte Sänger and Fritz Dellwo are confronted with a murder at a comprehensive school. The school psychologist Dr. Wick was brutally stabbed to death in her apartment. Because after the suicide of a student at Dr. Wick's place of work, which avoids fear, the director needs a replacement quickly. Charlotte Singer offers himself. This allows her to investigate undercover among students and teachers. Meanwhile, Dellwo investigates Karl Lichti, a rape convict and a client of Dr. Wick was.