When chief inspector Moritz Eisner (Harald Krassnitzer) is called to a murder case in a Viennese subway station, he has no idea that this day will change his professional life drastically. Because at the scene of the crime, Bibi Fellner (Adele Neuhauser), whom he knows as a colleague from the vice squad and who he knows has a problem with alcohol, is waiting for him. When she reveals to him that she is his new assistant,the unsuspecting Eisner falls from all clouds. It's pretty much the opposite of love at first sight, and Eisner bitterly complains to his boss, Ernst Rauter (Hubert Kramar). However in vain. But now a red-hot problem overshadows everything else. This crime in the context of the most serious juvenile delinquency indicates an extremely cold-blooded serial offender.