Sudden cardiac arrest at the age of only 29: Anna Schneider collapses dead in broad daylight on the street in front of her café. The Dresden investigators Gorniak and Winkler convince their boss Schnabel to take up the investigation into this mysterious death, although the medical examiner Jonathan Himpe wants to rule out poisoning. They found out that Anna Schneider had just filed a criminal complaint against an unknown stalker. In addition to the psychological stress, the victim has recently suffered from severe physical pain. Every little touch made her flinch. Gorniak is alarmed: she too has had pain attacks for a few days that she cannot explain. Even the medical officer cannot determine any medical cause.
She didn't know Anna Schneider, but could there be a connection between the two women ? Schneider's ex-boyfriend Nils Klotsche quickly finds himself in the sights of the inspectors. He works as a technical assistant in a medical laboratory specializing in the development of nanobots in cancer research. Is it possible to manipulate the molecules in such a way that they can be used as a weapon? His boss, Professor Mühl, and his colleague Martha Marczynski consider that impossible. Other suspects are also found: the married Lucas Dreesen, who had a short but intense affair with Schneider, could also be the stalker. There are increasing signs that Gorniak is actually being pursued.
She receives mysterious threatening phone calls and is repeatedly delivered video footage showing party scenes from around 20 years ago. Isn't the motive for this case jealousy at all?