At the Back of the North Wind
a little boy gets to know the North Wind, which is basically an angel of death for children. Sees the world, has adventures with his family, and then goes to the Back of the North Wind at the end of the book, which means he died.
Can’t say I really understood this very well. Filled with poems, songs, etc that I just skipped over. In essence, it seems to be a story about a little boy who dies. But it wasn’t really sad.