Laughs, thrills, suspense and excitement! Gould Trevor, who has recently served on a jury which convicted a man, receives threatening notes. Whipped into a frenzy by a frivolous neighbor, Jennie Trevor's housekeeper who has overheard Trevor talking of murder over the telephone, gets it into her head that Trevor plans to murder her. Jennie flees, and a strange young woman, who calls herself Mary Jones, takes over the position of housekeeper for Trevor. The excitement increases as mysterious happenings take place and everyone is suspected of murder