Fascinated by the human brain and its capacity for ruthlessness, psychiatrist Dr. Dorothy Otnow Lewis has spent her life investigating the interior lives of violent people. With each case, she came closer to developing a unified field theory of what makes a killer. Along the way - steering away from the conventional wisdom of her colleagues - she explored the world of multiple personality disorder.

A Tokyo psychiatrist is hoping to better his career by marrying the daughter of a prominent doctor. The match is threatened however when an attractive but very troubled tourist guide comes to him for consultation...