Genius Against Violence

Van Duylen representative of a diamond syndicate brings to Amsterdam the KohINoor II the largest diamond ever found In one of the citys oldest diamondcutting 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 burglarproof 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 liontamer Feenstra prowl around Van Duylens villa inspecting the doors and windows