When the acclaimed French film-maker Michel Hazanavicius was approached by his parents’ best friend, the author and playwright Jean-Claude Grumberg, to adapt his fairytale The Most Precious of Cargoes (2019) into an animated film, he hesitated. The short book is a fable about the Holocaust, and the extraordinary acts of kindness that people are capable of. Although moved by it, Hazanavicius was initially reluctant: he had never made an animated film, and he thought he would never make a film about the Holocaust. The grandson of eastern European immigrants who came to France from Lithuania and Poland in the 1920s,...