The son of an Argentine chemist travels to Vienna, to solve the murder of his father. Step by step, he realizes that his father was internationally entangled in secret service machinations and chemical weapon sales, and ends up in mortal danger himself. Meanwhile, he also realizes that there is no connection between his father's murderess and those dubious activities. Her motive for killing him goes back much futher, to a court hearing during the Third Reich...
Lawyer Maria Rohn takes on the case of Martin Siebeck. The truck driver allegedly ran over a man on the highway. Siebeck denies the crime and states that two people threw the victim in front of his truck at full speed. The more Maria Rohn looks into the case, the more she notices inconsistencies. Her husband Günther is also behaving more and more strangely. It seems that he was also involved in the accident...
The social worker Luise Gottschalk dedicates all her passion to the Viennese caretakers and derailed young people. Tirelessly, she advertises to adults for understanding the needs of adolescents. She is particularly committed to a girl named Elfie Breitner who is at risk of drifting into prostitution.