Scott Henderson (Alan Curtis) is drowning his sorrows after yet another fight with his wife. At a local bar, he meets a woman and they strike up a conversation. Sensing the woman is also feeling down and not wishing to be alone, he invites her to the theatre. She agrees under one condition; she does not wish to divulge her name, preferring to remain anonymous. When Henderson returns home he finds police officers waiting for him. His wife has been murdered, strangled with one of his neckties, and he is the main suspect. Maintaining his innocence he suggests they go back and speak with someone who might provide an alibi. But no one seems to remember the mysterious lady. Charged with the murder of his wife, it seems Scott Henderson will face the electric chair if he cannot prove his innocence. His only hope just might be his loyal secretary Carol "Kansas" Richman (Ella Raines). Can she find the phantom lady before it's too late?