Following a tragic school shooting, two sisters pen a tribute song and become musical superstars because of it. Years later, one of them (now played by Natalie Portman) is still trying to do the pop diva thing. But a fading career, a troubled daughter and a second, eerily familiar school shooting threaten to derail her career. Portman grounds writer-director Brady Corbet's second film with her riveting, give-it-all-you've-got performance. And Corbet certainly knows how to set an over-the-top electropop spectacle. But the plot (two of them, really) is a jagged puzzle-box assembly. 110 minutes R.