Max Ballauf and Freddy Schenk have to solve the murder of a pedophile ex-prisoner. The sympathy for Paul Keller is limited: After twelve years in prison, he was allegedly treated and only a few hours free. Now the body of the notorious child killer has been found in a residential dumpster, just like eight-year-old Kevin, his alleged victim. Inspectors Ballauf and Schenk are faced with a difficult task: the number of suspects is large, especially since the "Child Protection" citizens' initiative had publicly opposed Keller's release . Following the American model, the organization had published Keller's identity and place of residence on the Internet and distributed leaflets with his photo all over the neighborhood.
The driving force behind "Child Protection" is Kevin's father Stefan Maywald, formerly a very successful lawyer. After the death of his son, he devoted himself entirely to fighting the pedophile scene. But Maywald isn't the only one who isn't letting go of the past. The events and the slander from the neighbors also left their mark on Keller's family, his parents and his stepbrother.