Two anglers discover a pile of corpses in a field near the polish border. The unimaginably high number of skeletons and animal carcasses leads the police to suspect a serial killer who has apparently been killing undetected for decades. Local detective inspector Roland Voit (Felix Kramer) is assigned to support the large LKA contingent in the Oderbruch. His former childhood sweetheart, former policewoman Maggie Kring (Karoline Schuch), is also called to her home town of Krewlow. After years of silence, Maggie and Roland are anything but impartial. Maggie is following her own investigations. She left Krewlow in 1997 after her brother became a victim of the historic Oder flood at the age of 17. The ex-policewoman doubts everything she knows - including the death of her brother Kai.

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The large LKA contingent is searching for a serial killer in Krewlow and hopes to get a clue from the only survivor found on the pile of corpses. However, the seriously injured man is unresponsive. For the village doctor Frank Seeger (Torsten Ranft), it is clear that "Pulver-Paul" (André M. Hennicke) is behind the bloody deeds. The gun-crazy hermit is holed up on his farm and obsessively believes he has to defend himself against overpowering enemies. When Roland Voit (Felix Kramer) and Stanislaw Zajak (Lucas Gregorowicz) want to interrogate him, a life-threatening confrontation ensues. Meanwhile, Maggie (Karoline Schuch) is staying with Adrian Demko (Jan Krauter), her childhood friend who is in a wheelchair. She is convinced that the key to the Oderbruch serial murders lies in their shared past.

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In a mysterious vault beneath the pile of corpses, the police units discover not only more bones, but also a jar of water with leeches. The seemingly insignificant find awakens the memory of Kai, Maggie's missing brother, in Roland Voit (Felix Kramer) and Maggie Kring (Karoline Schuch). Kai was an extraordinary, mysterious boy. Maggie simply cannot and will not believe that he is no longer alive and now hopes to have found proof of this. She asks Adrian Demko (Jan Krauter) for help. Adrian has been in a wheelchair since a terrible accident in their youth, when an unexploded bomb from the Second World War exploded. He instructs his carer Marek Gorski (Adrian Topol) to accompany Maggie on a trip across the border to Poland. The trail leads them to a mysterious building in the border area - where Maggie is assassinated.

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Poland, summer 1990: ten-year-old Kai (Edgar Emil Garde) has been taken to safety by his mother Minna (Uta Janietz) to stay with Polish friends. His father Arthur (Stefan Weinert) wants to kill him because he suspects that Kai has a sinister tendency. His sister Maggie (Alix Heyblom) 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 (Bennet Mai) 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 (Liliom Lewald) also knows that the introverted boy is special. He seeks Kai out and offers him the chance to live with his "real" family.

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Maggie (Karoline Schuch) was right: Kai (Julius Gause) is alive! The siblings hide together in the abandoned forest hut. Kai's confession that he has many people on his conscience upsets Maggie just as much as his seemingly unimaginable explanation. After an attempted assassination, they are both in constant danger. Maggie turns to Voit (Felix Kramer) - without telling him that her brother is alive or revealing anything about his involvement in the series of crimes. Meanwhile, Voit's colleague Zajak (Lucas Gregorowicz) deciphers a mysterious document left behind by the survivor of the pile of corpses before his death. On the Polish side, schoolgirl Ilona (Nicola Magdalena Lüders) makes an eerie discovery. Something is wrong at the secluded boarding school for street children and runaways. Blood donations are compulsory, girls are disappearing and sinister men are coming and going.

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Kai (Julius Gause) can't live with his guilt and wants to shoot himself. Maggie (Karoline Schuch) saves him at the last second. She wants to give her brother the chance to work together to find the people behind the unimaginable crimes and make amends. In order to stop the series of crimes, the ex-policewoman sets out in search of the key figure: the "Great Hunter". A trail leads back to 1947, when two men came under suspicion of having committed gruesome murders. One of the suspects was Maggie's now 90-year-old father Arthur (Volkmar Kleinert), the other disappeared a long time ago. Together with Roland (Felix Kramer), Maggie uncovers a disturbing family secret.

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Maggie Kring (Karoline Schuch) and Kai (Julius Gause) 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 (Felix Kramer) 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 (Lucas Gregorowicz) 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.

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SoKo Krewlow is on the hunt for Marek Gorski (Adrian Topol), who has gone into hiding, but a deadly trap awaits the officers in his trailer. Meanwhile, mysterious men have taken control of the Polish boarding school. Pupil Ilona (Nicola Magdalena Lüders) fears for her life. On the run, she discovers a mysterious prisoner (Liliom Lewald). He promises to help if Ilona frees him. Roland Voit (Felix Kramer) is certain: there must be more than one perpetrator! When Gorski demands money from Demko (Jan Krauter) for his escape, the police team drives to a remote drop-off point. However, Maggie Kring (Karoline Schuch) and Voit see through the ruse. A fight for life and death begins with the "Great Hunter", in which Maggie outgrows herself - and makes a fatal decision. (Text: ARD)

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