Inspector Frank Thiel (Axel Prahl) and forensic pathologist Prof. Karl-Friedrich Boerne (Jan Josef Liefers) are investigating the case of a former police officer who was found dead on the street – wearing only panties. Boerne found no traces of violence on the woman's body. Inspector Frank Thiel from the homicide commission takes over anyway: Because why did Katja Braun run onto the street almost naked and then die of heart failure? At the Kripo, the victim is no stranger. Katja Braun used to be a police officer. Now her death has parallels to a case she once investigated. A prostitute had been strangled at the time. Their pimp Heinz Kock, also known in the scene as Heinz Hinkebein because of his walking disability, was considered an urgent suspect.
He went into hiding shortly before his arrest. Has he now taken revenge on the former commissioner? Or is Katja Braun's death more attributable to her alcohol problem? As a result, the relationship with her ex-husband Jörg Braun and her daughter Marie was obviously very tense. Meanwhile, a delegation of Russian police officers, under the supervision of police spokesman Michael Hausner, is trying to familiarize itself with local investigative practices.