Can you put a face to the banality of evil? How about two? On a bright London morning, Sandra Hüller and Christian Friedel are back from having their picture taken. The German actors are here to discuss The Zone of Interest, the film they have made with the director Jonathan Glazer (Under the Skin), loosely inspired by Martin Amis’s 2014 novel of the same name. But for a moment, we talk instead about Friedel’s liking for porridge; how Hüller, by contrast, doesn’t eat this early. And they smile and pause, aware of what comes next. In The Zone of Interest,...