Carla is a very young girl and on her way home from school when she misses the bus. Nobody can pick her up at home. It just doesn't fit. "No, it doesn't matter. I walk I'm faster there." On the way, she meets her killer and gets into his car.
The Munich chief inspectors Ivo Batic and Franz Leitmayr are assigned a colleague to help with the investigation. Gisbert Engelhardt served in the German army and is a techie. He creates a criminal profile and claims that he can filter out characteristic breaths of Carla's killer from Carla's last cell phone call.
On site, the man seems awkward. During the inspection of the body, he faints. Engelhardt is convinced that Carla's killer is a potential serial killer.
Batic and Leitmayr investigate in all directions. Carla's teacher, Herr Seifert, is also targeted.
The commissioners are at odds with colleague Engelhardt right from the start, he simply has too many "quirks". You can't help it and work to "praise him away". A fatal escalation, because Engelhardt now has to prove to "the best" that he is good for them. He sets out on his own to hunt down the phantom - a catastrophe takes its course...