Ina Zimmermann's son Paul and his girlfriend Sarah discover the body of a man in a lake. The dead man, Thomas Beckmann, has clear signs of fighting on the body. The focus of the investigation is on the dead man's family. When it turns out that Simon, the dead man's son, was forcibly adopted in the GDR, therapist Dr. Kruger under suspicion. Katrin Rust, a woman who has been looking for her prodigal son for years, is also suspicious. Paul Zimmermann's girlfriend Sarah is pregnant. That brings the teenagers into great conflicts.