Photo model Monika Stange is found murdered in her apartment in a major West German city. Detectives Bentheim and Laube find rough diamonds hidden in the apartment. The trail leads to a racketeering ring and the influential industrialist Dr. Vogelsang. The latter is not prepared to get involved in the murder case under any circumstances and refuses to testify. Inspector Laube tries to solve the case without his colleague.
Eberhard Esche
as Kriminalassistent Bentheim
Barbara Brylska
as Hanna Stern
Herbert Köfer
as Kriminalinspektor Laube
Helga Göring
as Lydia Amberger
Horst Schulze
as Dr. Ingo Vogelsang
Lilo Grahn
as Gitte Moosbauer
Angelika Waller
as Monika Stangel
Joachim Tomaschewsky
as Herr Brösel
Karl-Richard Schmidt
as Peter Lacour
Rolf Ripperger
as Dr. Sauer
Helmut Schreiber
as Herr Amberger
Dieter Wien
as Kriminaltechniker
