After a fight with his wife on their anniversary, Scott Henderson (Alan Curtis (American actor)), a 32-year-old engineer, picks up an equally unhappy woman in a bar and they take a taxi to see a stage show. The woman refuses to tell him anything about herself. The star of the show they are watching, Estela Monteiro (Aurora Miranda), becomes furious when she notices that she and the mystery woman are wearing the same unusual hat. When Henderson returns home, he finds Police Inspector Burgess (Thomas Gomez) and two of his men waiting to question him; his wife has been strangled with one of his neckties. Henderson has a solid alibi, but the bartender, taxi driver and Monteiro deny seeing the phantom lady. Henderson cannot even clearly describe the woman. He is tried and sentenced to death.