I thought that this book was relatively trite, and perhaps outdated, until my daughter started asking questions about what would happen if one lived in a regulated society, or if one lived on the moon. I forget the actual discussion, but I remember my surprise that the questions Earthdark deals with are exactly those she was pondering. It certainly is a sufficiently engaging novel, with nothing problematic or logically flawed. It did not move me excessively, but let's see how my 12-year-old daughter responds to it...