Nils-Olof Franzén

He was director of programmes for Swedish Radio from 1956 to 1973, and also wrote a number of biographies.
The first of his Agaton Sax books, ''Agaton Sax klipper till'', was published in 1955. According to a description inside ''Agaton Sax and the Criminal Doubles'', Franzén originally wrote the stories for his son. Provided by Wikipedia
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