Sudden cardiac arrest at the age of 29: Anna Schneider collapses in broad daylight on the street in front of her café. The Dresden police investigators Karin Gorniak and Leonie 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. The public medical officer cannot determine a medical cause. The detective chief inspector did not know Anna Schneider, but feels that she is being followed by an invisible person. Could there be a connection between the two women?