Agaton Sax and the Diamond Thieves Nils-Olof Franzen (Target, 1973) D B Derbyshire Bookseller Posted on May 23, 2019 Posted in Books Tagged with Agaton Sax, Books, Children's Books, Illustrated, Nils-Olof Franzen, Quentin Blake Just added… Agaton Sax and the Diamond Thieves.