One challenge facing any novel, drama or film about the Holocaust is to restore its sheer unimaginability. In Thomas Keneally’s Schindler’s Ark – filmed, of course, as Schindler’s List – when news reaches Krakow of what’s happening in Auschwitz, Keneally pauses for some editorialising. ‘To write these things now,’ he says, ‘is to state the commonplaces of history.