Agaton Sax and the Diamond Thieves (Swedish: Agaton Sax och de slipade diamanttjuvarna; published in English in 1965) is a book about detective Agaton Sax by Swedish author Nils-Olof Franzen.
[1] The Koh-Mi-Nor diamond is stolen and a very clever thief is putting messages about it, in a secret code, in the personal column of the newspaper published by the Swedish detective Agaton Sax.
This article about a mystery novel for children first published in the 1950s is a stub.
You can help Wikipedia by expanding it.See guidelines for writing about novels.
Further suggestions might be found on the article's talk page.