First the murdered body of a man is found in a puppet theatre, then another body is found of a student. At first it seems as if they have nothing in common, until Marc, Rex and Niki find the name of the two victims Attorney.

When another woman is murdered, Marc, Rex and Niki suspect that a serial murderer is at large as all the women have the same look - blonde and very beautiful. Without many suspects, it is up to Rex to sniff out the right postman - who is the murderer.