The social worker Andreas Haber is found murdered in the Stuttgart children and youth center Klaus' Haus. The investigations of the inspectors Lannert (Richy Müller) and Bootz (Felix Klare) are difficult, because there are many conceivable courses of action - and too many lies. The dead man's colleague, Kathi Dorst (Maryam Zaree), and his supervisor Sven Vogel (Tobias Oertel) are not very cooperative. And the financier and sponsor of Klaus' house, the industrial heir Frank Schöllhammer (Patrick Schöllemann), is also silent. A first suspicion falls on 13-year-old Sarah Baumbach (Ruby O. Fee), who was a constant guest in the youth center and lives with her sister Jeanette (Britta Hammelstein) with her macho friend Ronald (Antonio Wannek) Prager.
But what reason should the precocious girl have had to murder Andreas Haber? Schöllhammer is also suspicious. Because although the youth center is financed by the Schöllhammer Foundation, there is a lack of money everywhere - the payments seem to have stopped. The case takes a surprising turn when Sarah confesses to killing Andreas Haber. Although the existing traces match their statement, Lannert and Bootz remain skeptical. And while Sebastian Bootz can hardly reconcile his investigations with his family obligations, Thorsten Lannert suddenly finds his life in danger.