Frans Keulen

Uncle Theodor has died and is giving three million guilders to whoever finds the blue diamond. Ther…

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Billie Turf is a student at Dennenheuvel boarding school. According to his teacher Kwel, he is unre…

Billie Turf and Dolfie have to stay at boarding school during the summer holidays because their rep…

Colonel Brulgraag has found the will of King Krijn XXIV of Schiermeeuwen. Whoever finds Krijn's Swo…

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