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As police investigate the bizarre and brutal murder of alluring singer Katharina Läufer, five of her former classmates reunite at her funeral.
A missing persons case linked to the boarding school is reopened. When the friends play a strange game, tensions between Butsche and Roman boil over.
The detectives make a gruesome discovery. At the brothel, Butsche bonds with Pearl's daughter, Elsie. Nadja learns about the group's shared obsession.
The Third Substance
Butsche visits Elena for help with Elsie, angering Roman once again. Nadja drops a bomb on Grünberg and tests a provocative hypothesis about Katharina.
The Heart Notes
Elena seeks safety in an unlikely place, Roman exacts revenge, and secrets from the past surface as Nadja interviews Merten Brodmann's mother.
When another victim turns up, the police zero in on a suspect. Nadja's lingering doubts -- and a tip from Köhler -- lead to a shocking confrontation.
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