Young woman Suzy looks out of the window of her apartment and witnesses a man murdering a woman in the apartment directly across from hers. Suzy is so traumatized by what she sees that she's rendered mute. Suzy is placed in the care of Dr. Trask, who alas turns out to be the man who committed the murder she witnessed.
- A young woman, on her birthday, witnesses the doctor living across from her apartment, kill his wife, and suddenly loses her voice. Things go from bad to worse, when her husband checks her into the same doctor's clinic, only for him to find out that she was the only witness.