"Emma (Madeleine Stowe) is a young musician who has been blind for 20 years. New surgery techniques restore her vision but initially cause "vision flashes" that leave her uncertain about what she sees. One night, she is awakened by a noise in the apartment above. Peeking out her door, she "sees" a figure descending the stairs. She contacts the police, worried that her neighbor has been murdered, but is unsure if it was just her new vision deceiving her. The killer then begins "