 Bob Wallace breaks off his engagement to Millie Crest after involving her in an embezzlement scheme. Millie hurriedly leaves town and gives a lift to Fern Driscoll, who tries to highjack the car, causing it to plunge down a canyon. Fern is killed and Millie assumes her identity, traveling on to Los Angeles. There she is contacted by a shady insurance investigator, Carl Davis. Davis tries to recover incriminating letters from Fern/Millie, who knows nothing about them. That evening Millie protects herself by stabbing an intruder with an icepick. As the wounded intruder, Davis later contacts Millie, threatening to harm her if she does not produce the letters. Millie sends Perry Mason to represent her in the matter. Davis dies and Millie is charged with murder.