How should cinema tackle the horror of the Holocaust?

A baby is crying, but whose: the one in the nursery or someone else’s child, beyond the garden wall topped with barbed wire? A dog is barking, but is it the family pet or a far more menacing animal? In “The Zone of Interest” (pictured), an ambitious new film by Jonathan Glazer, the nursery and the dog belong to Rudolf Höss (played by Christian Friedel), the commandant of Auschwitz. The wall divides his family home from the adjacent concentration camp.