When Peter Faber joins Jan Pawlak and Rosa Herzog early in the morning, the forensics team has almost finished their work. Tram driver Hamza Arkadas was stabbed during his night shift. There are no witnesses, but the images from the surveillance camera show how Arkadas was first provoked and then attacked by a young passenger. The perpetrator showed his face offensively into the camera before fleeing, but the recordings are of little help at first. He doesn't seem to be known to the police, and public prosecutor Matuschek doesn't want to go public with the pictures yet. Rosa Herzog, who took over as acting head of the homicide squad in Faber's absence, gets support from police officer Beate Gräske. She is a “super recognizer” with the special ability to recognize faces – much better than her colleagues and the technology can do. With the help of surveillance cameras, she tracks down the perpetrator...