Julia is a young American woman living in Trieste, Italy, who is widowed on her wedding day when her husband Paolo is killed in a car accident where she is partly to blame.

She still keeps in close touch with Paolo's mother and father, but is cold and distant to her co-workers at the office and refuses to move on with her life or resume dating.

One evening after work, Julia drives her car through a mysterious and supernatural mist before returning to her apartment only to discover a strange woman living there.

Across the street, in the elegant home she and Paolo had purchased and which she never sold, she finds him and their five-year-old son, Marco, treating her as if they have been together all along and the fatal car accident never happened.

Determined to free herself from a loveless romance, Julia ends up killing Daniel by stabbing him to death in his hotel room one evening and then dumping the body into the bay.