With writer-director Thomas Bezucha’s Let Him Go opening this weekend, I recently had the opportunity to talk with Lesley Manville about her work in the fiery thriller. Based on the novel of the same name by Larry Watson, Let Him Go follows a retired sheriff named George Blackledge (Kevin Costner) and his wife Margaret (Diane Lane) who set out to rescue their young grandson from the clutches of a dangerous family living off the grid in the Dakotas, headed by matriarch Blanche Weboy (Manville). When they discover the Weboys have no intention of letting the child go, George …