Maggie was right: Kai 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 - without telling him that her brother is alive or revealing anything about his involvement in the series of crimes. Meanwhile, Voit's colleague Zajak deciphers a mysterious document left behind by the survivor of the pile of corpses before his death. On the Polish side, schoolgirl Ilona 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.

Kai can't live with his guilt and wants to shoot himself. Maggie 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, the other disappeared a long time ago. Together with Roland, Maggie uncovers a disturbing family secret.

SoKo Krewlow is on the hunt for Marek Gorski, 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 fears for her life. On the run, she discovers a mysterious prisoner. He promises to help if Ilona frees him. Roland Voit is certain: there must be more than one perpetrator! When Gorski demands money from Demko for his escape, the police team drives to a remote drop-off point. However, Maggie Kring 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.