In A Prophet, a dazzling new film about innocence and power from Jacques Audiard (director of The Beat My Heart Skipped, 2005), 19-year-old Malik (Tahar Rahim) is about to embark on a six-year prison sentence for assaulting a cop. Polite and deferential, Malik is hard to read at first. The little we glean about his life is framed in terms of negatives: he has no contacts, no relatives; he didn’t grow up with his parents, but in juvenile centres. If he’s experiencing fear as he enters the chaos of the prison at Brécourt, he doesn’t show it. He’...