- A man is found murdered, and witnesses are sure about the woman they saw leaving his apartment. However, it becomes apparent that the woman has a twin, and finding out which one is the killer seems impossible.
- A woman suspected of murdering her doctor boyfriend has an identical twin sister. When both twins have an alibi for the night of the murder, a psychiatrist is called in to assist a detective in solving the case. Through a series of tests, he discovers which twin actually committed the crime, and in the course of his investigation he falls in love with one of them.—Neil Doyle <Doylenf@msn.com>
- When Dr. Frank Peralta is found stabbed to death straight to the heart in his apartment, two neighbors swear to the veteran Lt. Stevenson, who is charge of the investigation, that they saw Ruth Collins leaving his apartment late that night. The detective interrogates Ruth and she has the alibi of three witnesses that she was walking in Jefferson Park during the night. Then he visits Ruth in her apartment and discovers that she has an identical twin sister, Terry. Lt. Stevenson does not know who the killer is and the prosecutor declines to open the case. Dr. Scott Elliott, a specialist in twins who had been contacted by Lt. Stevenson and has a crush on Ruth, offers the sisters a reasonable sum for submitting to a series of tests for his research of personalities of twins. Through the results, Scott finds that Terry is psychotic and Ruth might be in danger.—Claudio Carvalho, Rio de Janeiro, Brazil
- When Det. Lt. Stephenson investigates the murder of a doctor, who was found stabbed in his apartment, he learns that he had dinner with a woman named Teresa Collins the evening of his death. It looks like an open-and-shut case when several residents of the apartment building identify the woman. Then he discovers that she has a twin sister, Ruth, and neither will implicate the other as being the woman who was there. Dr. Scott Elliott, a psychologist who has made a study of identical twins, agrees to look into the case and concludes that one of them is insane. Complicating matters is the fact that he is falling in love with one of them.—garykmcd
- Lt. Stevenson is in charge of the murder investigation of Dr. Frank Peralta, who was found dead in his apartment by his cleaning lady first thing in the morning, he stabbed in the heart. The chief suspect is the attractive young woman seen leaving his apartment the night before, Stevenson eventually learning she his girlfriend, Terry Collins, who operates a confectionery stand in an office building lobby. When Stevenson questions Terry, she has an airtight alibi in being seen at exactly the same time somewhere else. It isn't until Stevenson visits Terry later that the explanation for that double vision is that there are two of them, namely an identical twin sister named Ruth Collins, roommates who knew this information would come to light. Having planned their stories, they as a combination admit to one being seen out and about, the other at home alone, neither stating who was who with the one out and about protecting the one at home who would not have anyone to corroborate her story. With none of the eyewitnesses able to confirm who they saw between the two sisters, the sisters seem to have pulled off the plan successfully. However, one of Dr. Peralta's colleagues, Dr. Scott Elliott, who often patronizes Terry's stand, believes he can help Stevenson in he actively studying twins as part of his on-going research. Although somewhat suspect, the sisters ultimately agree to be part of Elliott's research, he not telling them about his association with Stevenson. Elliott knows that if one of the sisters truly is the killer, the innocent sister may be at risk. Complications ensue as a mutual attraction develops with both sisters and Elliott in the process, his life also at risk if he doesn't provide an accurate assessment of the situation.—Huggo
- When a man is discover stabbed in the back witnesses point out the woman they saw at the scene of the crime, the demur Ruth Collins (Olivia de Havilland) but their eye-witness account goes bad when they see Terry Collins (Olivia de Havilland) the twin sister. During their psychically and physically connected lives the two have actually pretended to be each other for many reasons like subbing for one another at work and other activities. In this case it seems that one cant believe that the other could do anything so horrible. On the case is Lieutenant Stevenson (Thomas Mitchell) but when he realizes that he cant bring in the killer without the aid of the twin, he turns to Dr. Scott Elliott (Lew Ayres) to do a psychological profile of the women to see if the real murderess can be spotted. When Dr. Elliott realizes that one twin is an insane killer the situation turns deadly.
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