Sudden cardiac arrest at the age of only 29: Anna Schneider collapses in broad daylight on the street in front of her café. The Dresden investigators Gorniak and Winkler convince their boss Schnabel to start the investigation into this mysterious death, although the forensic doctor Jonathan Himpe wants to rule out poisoning. They found out that Anna Schneider had recently filed a criminal complaint against an unknown stalker. In addition to the psychological distress, the victim has recently suffered severe physical pain. Every touch, no matter how small, 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 a medical cause. Anna Schneider didn't know her, but could there be a connection between the two women? Schneider's ex-boyfriend Nils Klotsche quickly falls into 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 weapons? His boss Professor Mühl and his colleague Martha Marczynski consider this to be impossible. Other suspects are also found: the married Lucas Dreesen, who had a brief but intense affair with Schneider, could also be the stalker. There are increasing indications that Gorniak is actually being persecuted. She receives mysterious threatening phone calls and repeatedly receives video recordings showing party scenes from around 20 years ago. Isn't the motive for this case jealousy at all?
—ARD Das Erste