Agaton Sax and the Diamond Thieves by Nils-Olof Franzen
Published: 1959 | Series: Agaton Sax 4 When the Koh-Mi-Nor diamond is stolen, the thief leaves coded messages about it in the personal column of the newspaper published by the Swedish detective Agaton Sax. About Nils-Olof Franzen Nils-Olof Franzén (1916–1997) was a Swedish writer who wrote the Agaton Sax series.