Inspector Pia Sander's alarm bells ring when her sister Kim suddenly disappears. The incident fits perfectly into the well-known perpetrator profile. For fear of being personally affected by the current case, Pia feverishly drives the investigation forward together with Oliver von Bodenstein. It is striking how often the trail of the perpetrator leads to the villa of the Reifenrath family, whose foster children once experienced something traumatic. In addition, the inspector has to realize that her sister's past hides dark secrets.