These are the only 2 books I have that my grandmother wrote (under a pseudonym). She was a contract writer in the 1960s for popular children's book publishers in Germany, chiefly Schneider Bücher.
Dilbi is another one of hers (cover image found online) - but most of these books were fodder for voracious young readers and have disappeared without much trace.
My grandmother liked to pick what were then considered 'exotic' locations and Dilbi awakened my interest in the beautiful Balearic Islands. So in the late 60s I travelled to Ibiza, which back then was still a sleepy tourist destination.
I remember how as 12-year-olds we went to the local stationery shop regularly to check out new arrivals of our favourite Schneider series. By far the runaway top sellers were (for girls) the Hanni und Nanni books; and for boys the Burg Schreckenstein ones. Both were set in boarding schools, a sure recipe (to this day) for childhood fascination. And yes, you read that right: books were colour-coded and marketed for Girls and Boys!
H & N live on in audio book format. The interesting facet is that these were adaptations (heavily edited and localised) of Enid Blyton's St Clare's series, spun off into its own German version. https://en.m.wikipedia.org/wiki/St._Clare's_(series)
