Saalfeld - 13 - Kinderland

15-year-old Anna Römer is reported missing by her mother. Shortly thereafter, a young girl is found dead near a children's prostitute in Leipzig. But the murder victim is not Anna, but Lisa Noack, who lives on the street. Inspectors Saalfeld and Keppler ask around in the street children scene and come across Gerd Tremmel, the head of the aid association "Kinderland eV", and his wife Claudia, who treated Lisa as a doctor free of charge. Her son Paul was Lisa's boyfriend and had a heated argument with her shortly before she was murdered. The detectives find out that Lisa was pregnant, but Paul didn't want to keep the child.
At the same time, a 15-year-old woman was found dead in the Rhine in Cologne. Initial investigations reveal a connection to Saxony: Sarah Stellwag had been arrested several times in Leipzig for prostitution. The Cologne inspectors Ballauf and Schenk set off, but without first registering with their colleagues in Leipzig. When Keppler, who wants to investigate the children's prostitution, mistakes chief inspector Ballauf for a suitor, a serious argument ensues. The four commissioners then diplomatically agree on joint investigations.
The missing Anna Römer, meanwhile, has found shelter with Olaf Dürer, a seedy man in his mid-thirties who takes homeless young girls in for a few nights, allegedly without asking for anything in return. After hints from the scene, Ballauf and Keppler track him down and are able to stop him after an attempt to escape. In his apartment, the detectives find a terrified Anna, who ran away from home after discovering that she is not her mother's biological child. The detectives stumble upon a case of child abduction many years ago.