
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.
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Adelqui Migliar
Pim Bruce
Mary Beekman
Vrouw van de huisvriend / Wife of the family friend

Aaf Bouber
Vrouw van Veerman
Jan Cijsch
Huisvriend / Family friend
Henni Hillebrand
Jack
Herman Hulsman
Diamanthandelaar / Diamonddealer
Manus Hulsman
Van Duylen
Hendrik Kammemeijer
Agent / Policeman

Jan Lemaire Sr.
Kantoorbediende / Clerk
Hetty Ruijs
Vrouw van de diamanthandelaar / Wife of the diamonddealer
Jacques Sequeira
Diamanthandelaar / Diamonddealer
Jacques van Hoven
Kantoorbediende / Clerk
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