An actress named Elisabet (Liv Ullmann) elects to become silent and is put into the care of Alma (Bibi Andersson), a nurse companion. The actress’s act, we soon learn, has two aspects: it is a wish for ethical purity, but it is also a species of sadism, a virtually impregnable position of strength from which to manipulate her nurse, who is charged with the burden of talking. By the end of the film, the two characters are engaged in a desperate Strindberg-like duel of identities, and Ingmar Bergman has turned that struggle into a metaphor for the fate of language, art, and consciousness itself.