After an argument with her lover during a yachting party, a woman disappears from the Sicilian island they’ve been exploring. Both the lover and her best friend set out to find her, but the urgency of their search dissipates as they fall into a disquieting sexual relationship. Antonioni’s celebrated film, which he once described as “a detective story back to front,” displays the director’s fascination with landscape, geometry, and architectural forms as means of expressing the troubled state of Italy’s postwar middle class.