Agaton Sax and the Diamond Thieves (; published in English in 1965) is a book about detective Agaton Sax by Swedish author Nils-Olof Franzen.
Detective Agaton Sax and the Jewel Heist (; published in English in 1965) is a novel by Swedish writer Nils-Olof Franzen, focusing on the character of Agaton Sax.