Dr. Jan Bergmann tries to stop a street mugging, decisively helped by passing-by Franzi's police badge. He seeks police help finding the rings are missing he carried as best man for clumsy buddy Arne Göhr, who is missing, also frantically looking. Mattes must take it seriously as the an's apartment was broken into and ransacked. Ring, intruder and Arne are found separately, all with separate stories, including misguided teen admirer Bill Müller.
—KGF Vissers