Frederike Bader stops a crime in a supermarket and finds herself entangled with a dubious private investigator. Her daughter Mia breaks one of the golden rules of witness protection.

Ferdinande puts Frederike under pressure to help him get out from under suspicion of murder. Archaeologists are approaching a dig that some people would prefer was left untouched.

With a joint investigation into a missing student, Ferdinande and Frederike become a team. Frederike's previous and antagonistic overseer becomes head of Passau police.