Twelve-year-old Sven Reimer (Daniel Spies) is found dead in a forest at a children's holiday camp near Regensburg. Commissioner Ellen Lucas (Ulrike Kriener) and her team are called to the crime scene. At first it all looks like a tragic accident, but investigators quickly uncover forensic evidence pointing to murder. The Lucas team is investigating under high pressure. Lars Berger (Aljoscha Sena Zinflou), one of the supervisors, has no alibi for the time of the crime and quickly becomes a suspect. Berger is from Africa, and Stefanie (Mia Sophie Wellenbrink), daughter of investigator Martin Schiff (Alexander Lutz), who is also spending her holidays at the summer camp, claims to have seen a black man near the crime scene. The children in the camp play the game: 'Who's afraid of the black man'.
But then the homeless Antholz (Peter Kurth), who was the victim of an accident near the quarry, is picked up. The forensic technology finds clear traces that convict Antholz as the perpetrator. Ellen sharply interrogates Antholz. Antholz admits to having found the boy lifeless in the forest, but vehemently denies the crime. Unbelievable for everyone, Antholz dies – during the interrogation – as a result of his accident. The case is closed for Chief Inspector Noethen (Michael Roll), but when Inspector Lucas discovers discrepancies in the profile of the perpetrator, she researches on her own. She checks into the Donauterrassen inn, which is located directly at the scene of the crime. There she recognizes the dark machinations of the inn owner Jürgen Müller (Bernd Tauber) and his daughter Katja (Alice Dwyer).
But the head of the Schweiger holiday camp (Robert Gallinowski) is behaving conspicuously, and supervisor Lars continues to refuse to reveal his alibi. After Ellen Lucas observes that the foster child Tim (Sandro Ianotta) reacts anxiously, she turns to the boy. What does Tim know, and what's up with the magic stone that disappeared without a trace after Sven's death? Tim, who, like his friend Sven, is a child in an