Genius Against Violence

Van Duylen, representative of a diamond syndicate, brings to Amsterdam the Koh-I-Noor II , the largest diamond ever found. In one of the city's oldest diamond-cutting establishments it is cleft and the nine small stones are polished. Escorted by detectives, Van Duylen takes the stones home and puts them in his burglar-proof safe. He tells his wife that its doors are electrically charged and that anyone opening them in the wrong way will immediately be electrocuted. Two suspicious persons, Jack the Acrobat and the lion-tamer Feenstra, prowl around Van Duylen's villa, inspecting the doors and windows.

• Theo Frenkel Sr.Director

• Adelqui MigliarPim Bruce
• Mary BeekmanVrouw van de huisvriend / Wife of the family friend
• Aaf BouberVrouw van Veerman
• Jan CijschHuisvriend / Family friend
• Henni HillebrandJack
• Herman HulsmanDiamanthandelaar / Diamonddealer
• Manus HulsmanVan Duylen
• Hendrik KammemeijerAgent / Policeman
• Jan Lemaire Sr.Kantoorbediende / Clerk
• Hetty RuijsVrouw van de diamanthandelaar / Wife of the diamonddealer
• Jacques SequeiraDiamanthandelaar / Diamonddealer
• Jacques van HovenKantoorbediende / Clerk