Genie tegen Geweld plot
Van Duylen, representative of a diamond syndicate, is bringing the largest diamond ever, the 'Koh-i-Noor II', to Amsterdam. In one of the oldest diamond polishing factories in the city, the stone is split and the nine small stones are polished. Escorted by detectives, Van Duylen takes the stones home and puts them in a safe. He tells his wife that the safe doors are electrically charged and that anyone who tries to open them the wrong way will be immediately electrocuted. Two dubious people, Jack the Acrobat and lion tamer Feenstra, sneak around Van Duylen's villa and inspect the windows and doors.