Anne Bach convinces the public prosecutor's office to agree to a search of the cemetery gardener Jürgen Becker's house. In the house there are weapons, handcuffs and other paraphernalia used to hold people captive. In the garden - in front of Thomas Bethge - the police dig up a buried car and the corpse-sniffing dogs arrive. But there is no trace of Barbara Neder. Jürgen Becker finds out about the police operation in his house and flees across Germany until an accident stops him.

Together with a private team of investigators, the so-called core team, Bethge reopens his sister's case after his retirement, obtains all the files and manages to get into Becker's "secret" room again. There, even many years later, there were overlooked indications of a serious suspicion. Did his sister fall victim to a mysterious serial killer?

A new witness describes Jürgen Becker as a sadistic and unscrupulous seducer who tried to get money in every conceivable way. Anne Bach, together with Thomas Bethge, creates the image of a psychopathic serial killer who, since childhood, has tried to satisfy his experiences of powerlessness on his victims. Thomas Bethge once again looks at Jürgen Becker's farewell letters in search of the secret of his missing sister.