Almost 15 years, the unequal sisters Mia and Susanne have not seen each other. But after her mother's death, Mia returns to her family. Problems are preprogrammed. But the fight for the family business and the memory of an old unfortunate pact connect the freedom-loving Mia and the family man Susanne.

Pola investigates on her own after her friend Tina has disappeared without a trace after a blind date on the Berlin Museum Island. Tina's profile on a dating portal finally leads Pola to her lover Sven. At the same time, Tina's husband Karl receives a sex video featuring Tina and Sven. A short time later, Sven is dead, and the bound Tina is released from his apartment. Everything points to Karl as the culprit.