The detectives make a gruesome discovery. At the brothel, Butsche bonds with Pearl's daughter, Elsie. Nadja learns about the group's shared obsession.

Butsche visits Elena for help with Elsie, angering Roman once again. Nadja drops a bomb on Grünberg and tests a provocative hypothesis about Katharina.

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.