"I want to report a murder." With these words, Sven Döring enters the Frankfurt homicide squad offices late one night. Chief Inspector Mey leads him into the only room where the lights are still on: Her colleague Steier's office. "My son had been in a coma for a year and I know it's his girlfriend's fault. She tried to kill him, and your officer Seidel covered it up." Cab driver Döring has obvious..

Early in the morning, inspector Conny Mey is called to the train station, still in her jogging suit. A bloody body was found in the night train from Warsaw, shot to death. A suspect fled the scene when the police arrived. Inspector Frank Steier, just released from the hospital after a gunshot wound, is there as well. The homicide team pays a visit to the dead man's widow Elsa to break the news. Sh..

Conny Mey and Frank Steier are called to the scene of a crime in inner city Frankfurt. The victim is Ramona Förster, a prostitute. From seedy reporter, Kurt Eggers they learn that there was a similar case in Offenbach six months previously. Could this be the work of a serial killer? Steier is afraid that Conny is becoming too emotionally involved in the case and warns her about it. She, though, is..

A 19-year old is found murdered in his cell in a juvenile detention center. In addition, eight of his toenails had been removed. Another inmate had been mistreated in this way, but he survived - and is refusing to speak? At the morning wake-up call, 19-year old Mustafa Zeydan is found dead in his cell. Frank Steier and Conny Mey are permitted to investigate the course of events, but how did the mu..

A violent criminal walks free when Steier's testimony is called into question, leading the detective to quit the force and seek justice for the young girl who was killed. Instead he discovers that the shooter and his cronies are planning a break-in which also ends with a fatal shooting.