English schoolboy and his Dutch pen friend chase a diamond smuggling gang in Holland.
Sean Scully
Tim
Jacques Verbrugge
Piet
Sandra Spurr
Annike
Walter Randall
The Guide
Thom Kelling
Van Helder
Riek Schagen
Mrs. Van Helder
Paul Ostra
Diamond Cutter
Sacco van der Made
Police Superintendent
Jean Lemaire
Grandpa
John Soer
Man in Blue
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