Dr. Bill Capa, a New York psychiatrist, falls into a deep depression after an unstable patient dies by suicide in front of him by jumping from his office window. The sight of the bloody body clad in a bright green dress causes Bill to suffer from psychosomatic color blindness, taking away his ability to see the color red. Bill travels to Los Angeles to stay with a friend, fellow therapist Dr. Bob Moore, who invites him to sit in on a group therapy session. However, Bob is violently murdered in the office and Bill is plunged into the mystery of his friend's death.