In Ingmar Bergman's "Persona," two women — a nurse and a stage actor — are brought together by sheer circumstance, which forces them to reckon with essential truths about one another. The actor, Elisabet Vogler (Liv Ullmann), has inexplicably stopped speaking while performing "Elektra" onstage, and her silence appears to be self-imposed. With the intention of helping her speak again, the nurse, Alma (Bibi Andersson), takes Elisabet to a secluded cottage by the sea. What ensues is a fever...