Ubbo Heide, the retired former head of the Aurich criminal investigation agency, receives a package. Inside is the severed head of a former prime suspect who was never convicted. On closer inspection, Ubbo recognizes Bernhard Heymann, who was the main suspect in the murder of his own daughter, six-year-old Steffi, a few years earlier. Rupert finds out that the parcel was posted by a woman in her mid-30s. The sender's name and address turn out to be fictitious. Ann Kathrin Klaasen and Frank Weller go to Ubbo to examine the severed head. The images from the surveillance camera at the post office show a petite woman looking around anxiously in the queue at the counter. Marion Wolters finds out that the woman is Svenja Moers and was suspected of poisoning her husband five years earlier. Due to a lack of evidence, she was released at the time. She hasn't been seen for days now, and Ann Kathrin puts out a manhunt for her. It seems she has been kidnapped. Who is behind her abduction? (thetvdb.com)