There’s an old saying about how you can choose your friends but you can’t choose your family. You also can’t generally choose your neighbors, and sometimes they can be even harder to avoid than family. It can be a real risk to try to befriend a neighbor, because if it all goes wrong somehow your only option is to pack up and move, and that’s a hassle nobody wants. Still, in Under the Tree, both sets of neighbors would have been much better off if they’d fled to opposite sides of the country. Admittedly Iceland isn’t a very big country, but that might have worked.