The LKA investigators Maik Briegand and Annalena Gottknecht put Florian Langendorff, the friend of Maik's ex-wife, under pressure during the interrogation. Finally he admits that the murder victim Ramona sold him coke. But he denies killing her.

The publications about Ramona's death shocked Maik Briegand's father Karl, who was also a police officer. 30 years ago he investigated the "Katti" case. She was his son's childhood sweetheart and died under mysterious circumstances. Maik wants to know from his father why he is now dealing with Katti's death again.

During her research, LKA investigator Annalena Gottknecht came across other murders in the region that were not solved. All of the victims are young women who were strangled and from whom a sexual offense could not be ruled out - as with Ramona Schinschke, however, there were no genital injuries or traces of sperm in the young women.