When the body of the well-known investigative journalist Sandra Walch was found in the Danube on a foggy autumn morning in Linz, this triggered an alarm in the Vienna Ministry of the Interior and Moritz Eisner (Harald Krassnitzer) was immediately dispatched as a special investigator. On the spot, Eisner learns that the reporter had been researching a red-hot story, which she surprisingly no longer wanted to publish. Astrid Heidegger (Martina Theresia Stilp), the dead man's best friend, gives chief inspector Moritz Eisner and his colleague Karin Brandstätter (Fanny Stavjanik) and their assistant Wolfgang Rohrmoser (Michael Menzel) from the Linz homicide squad a first concrete tip - apparently it was Sandra Walch to uncover dirty deals in artificial insemination.
Investigations in a fitness studio and in another murder case, in which the genetic engineer Max Biro (Arthur Klemt) is shot, lead to a clinic where artificial insemination is carried out. Apparently, a lot of money can be made by fulfilling the desire of desperate couples to have children. But what is the dark secret of this clinic, which has already claimed two lives? Who are the masterminds in the background and what role does the beautiful musician and pianist Maria Drenkow (Dorka Gryllus), who also plays with Eisner's heart, play? When the chief inspector narrowly avoids an assassination attempt while searching an apartment, he realizes in a flash that the killer obviously knew all about it and was waiting for him.
Shortly thereafter, the owners of a fitness studio, Stefan Weber (Daniel Keberle) and his wife Julia (Tamara Metelka), to whom the clinic regularly sent patients for pregnancy exercises, are blackmailed by kidnapping their son. Moritz Eisner now knows that the foreign clients are entitled to any means to obtain explosive documents that would uncover the criminal activities...