A classically trained musical genius, chart-topping chanteuse, and Black Power icon, Nina Simone is one of the most influential, beloved, provocative, and least understood artists of our time. On stage, she was known for utterly free, rapturous performances, earning her the epithet "High Priestess of Soul." But amid the violent, day-to-day fight for civil rights, she struggled to reconcile artistic ambition with her fierce devotion to a movement. Director Liz Garbus sensitively explores the constant state of opposition that trapped and tortured Simone -- as a classical pianist pigeonholed in jazz, as a professional boxed in by family life, as a black woman in racist America -- and in so doing, reveals a towering figure transcending categorization and her times. The film stays true to Simone's subjectivity by mining never-before-heard tapes, rare archival footage, and interviews with close friends and family.