Daybreak 2250 A.D. (aka Star Man’s Son) is one of the first books I read by Andre Norton. I first read it when I was fifth grade and for some reason, it was in the adult section of the Library. (The novel actually has a “young adult” feel to it, and one of the hard back editions actually has illustrations.) After re-reading it, I found that it had aged very well, even with the “post-apocalyptic neo-barb syntax,” that makes everyone sound like movie-western Indians type “eloquent.” The general message is the importance of cooperation between groups of people and not judging people by how they look. (There is also some commentary about race, presented in a very subtle fashion.)