Bergman at his most brilliant as he explores the symbiotic relationship that evolves between an actress suffering a breakdown in which she refuses to speak, and the nurse in charge as she recuperates in a country cottage. To comment is to betray the film's extraordinary complexity, but basically it returns to two favourite Bergman themes: the difficulty of true communication between human beings, and the essentially egocentric nature of art. Here the actress (named Vogler after the charlatan/artist in The Face) dries up in the middle of a performance, thereafter refusing to exercise her art. We aren't told why, but from the context it's a fair guess that she withdraws from a feeling of inadequacy in face of the horrors of the modern world; and in her withdrawal, she watches with detached tolerance as humanity (the nurse chattering on about her troubled sex life) reveals its petty woes. Then comes the weird moment of communion in which the two women merge as one: charlatan or not, the artist can still be understood, and can therefore still understand. Not an easy film, but an infinitely rewarding one.
Cast and crew