Oderbruch

Poland, summer 1990: ten-year-old Kai has been taken to safety by his mother Minna to stay with Polish friends. His father Arthur wants to kill him because he suspects that Kai has a sinister tendency. His sister Maggie fearlessly stands up for Kai and has to protect him from other children. A fight breaks out on the way to school, in which the leader Conradi is seriously injured and Maggie is knocked unconscious. Kai swears to his father that he will never tell Maggie the truth about himself. A sinister man also knows that the introverted boy is special. He seeks Kai out and offers him the chance to live with his "real" family.

Maggie Kring and Kai travel to the Carpathian Mountains. There, the siblings try to find out who the mysterious man is who came to the Oderbruch with their father in 1947 as a former war deserter. In Romania, however, they initially come up against a wall of silence. Roland Voit follows Maggie's tracks, even though he has been suspended from the case. He discovers the body of a dead teenager in the forest hut. When his Polish colleague Stanislaw Zajak tracks him down, Voit has no choice but to play his cards close to his chest. Zajak entrusts him with a theory about similar unsolved and mysterious murders in other countries and forces Voit to help find Kai.