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E1 Jesch
The brutal cop Volker caused the death of Soufiane Hamid, who fell from the balcony during a raid. Five years later, officer Volker dies in the same way as Soufiane, but it is suspected that someone apparently assisted Volker.
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E2 Wound
Martin Jesch kills police officer Gerry Engler with an axe, whose head is found in a park with a head full of blood. Engler had killed a young man with an iron five years ago.
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E3 Frost
Wilder and Kägi search for headmistress Patrizia Schellenberg, whom the serial criminal has chosen as the third victim. Patrizia allegedly let drug courier Lola Mbeki freeze to death.
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E4 Cellar
Aeby says she met the supposed serial killer a few years ago. During this meeting, Aeby discussed the cases about Volker, Schellenberg and Engler with him.
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E5 Process
Rosa Wilder drives with prosecutor Mettler to the place where another body has been found. Mettler gets anxious when forensic experts discover fingerprints.
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E6 Blind
Rosa, Kägi and Mettler go to Martin's house and find poor Max Zimmermann unconscious. However, Mettler notices Martin's footprints in the snow and follows them.