Alois Theodor Sonnleitner (1869–1939)

Two kiddos get stuck in a mountain valley without any adults to help them, and so they need quickly to learn how to survive in the wilderness on their own.
I tend to enjoy these kinds of kid survival stories, but this one fell completely flat for me. The children aren't given personalities much at all, and the tone is bleak instead of cheering-them-on optimistic. So, blech.

The first book is still almost believable, but by the third book it has lost all relationship to reality.