When a singer is found murdered, with her scent glands excised from her body, detectives probe a group of friends who attended boarding school with her.

1. Ambergris 53m As police investigate the bizarre and brutal murder of alluring singer Katharina Läufer, five of her former classmates reunite at her funeral.

2. Skatole 56m 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.

3. Synthesis 57m The detectives make a gruesome discovery. At the brothel, Butsche bonds with Pearl's daughter, Elsie. Nadja learns about the group's shared obsession.

4. The Third Substance 60m Butsche visits Elena for help with Elsie, angering Roman once again. Nadja drops a bomb on Grünberg and tests a provocative hypothesis about Katharina.

5. The Heart Notes 67m Elena seeks safety in an unlikely place, Roman exacts revenge, and secrets from the past surface as Nadja interviews Merten Brodmann's mother.