Mimi Leader’s On the Basis of Sex (B) takes a page out of the Spielberg Lincoln playbook by telling the story of a pivotal player in American life through the lens of a single subplot that succinctly illuminates an individual’s singular belief system. In this new movie, that person is Supreme Court Justice Ruth Bader Ginsburg (also chronicled in an awesome recent documentary RBG); and she’s splendidly embodied by Felicity Jones, playing the part with a quiet ferocity. Opposite a game Armie Hammer as her supportive lawyer husband and opposite old-fashioned adversaries played by the likes of Sam Waterston, Jones’s Ginsburg gets a lovely pedestal on which to shine. She’s most rousing in the moments in the margins, like when she notices she’s being fetishized by a make job interviewer or when she realizes her teen daughter has inherited her stubbornness. Her public performances lack some of their intended punch, but it’s hard not to get caught up in the case setting her destiny in action. The filmmakers were shrewd to choose a rather cut and dry example of discrimination on which to base the film’s central narrative; there were certainly pricklier scenarios they could have spotlighted which would have challenged the director and audience more. The storytelling is a bit predictable but still very lovingly rendered, and it’s a thrilling showcase of both actress and subject. In these times, there can hardly be enough films like this.