New York private detective Duncan "Mac" MacLain is blind but has keenly developed all his other senses. He pursues his work assisted by his faithful guide dog Friday, his butler, Alistair, and his assistant, Marty. Retired actress Norma Lawry, an old friend, comes to Mac seeking advice. Her headstrong 17-year-old step-daughter Barbara, herself a promising actress, is enamored with her leading man in a small theater production, the much older Lothario Paul Gerente. Paul, who had once been Norma's lover, has convinced Barbara that Norma actually wants Paul for herself and has only married her father Stephen for his money. At Mac's urging, Norma tried to reason with Paul, but he insists that he loves Barbara and laughs her off. Barbara is equally disdainful of her and agrees to meet Paul for dinner that night at his apartment.
　　Norma's husband Stephen Lawry is a scientist leaving that night on a trip to test a secret invention on which he has been working for the government and the war effort. Worried about Barbara, she uses a pretext not to accompany Stephen and goes to the apartment. When Barbara arrives, she finds Paul's dead body and thinks that Norma has killed him, even though Norma insists that he was dead when she arrived. Barbara threatens to call the police unless she leaves Stephen. Fearing that a scandal will hurt him, Norma agrees. Norma then turns to Mac, who goes to Paul's apartment with Friday and Marty, only to find the body and the rug under it missing. A man arrives to replace the rug and Mac hides in a closet, overhearing a telephone call to Norma's number from "Gabriel" to "Vera." Mac accidentally gives himself away, but with Friday's help overpowers Gabriel, who refuses to talk. Mac has Marty hide him to keep him under wraps.
　　Norma returns to her country home unexpectedly, which discourages an espionage ring that includes her butler, Hansen, from breaking into Stephen's safe and stealing his plans. They have killed Gerente, who was also an agent, and hidden the body. Mac arrives with Friday at Norma's house and pretends to be her curmudgeonly "Uncle Mac" who has come for a visit. His blindness lulls any suspicions Hansen might have about him. Shortly thereafter, Barbara comes home from an "emergency rehearsal", called to get her out of the house by her director, Cheli Scott, who inveigles an invitation to spend the night at the Lawry home. Unknown to Barbara and Norma, Cheli is the ringleader of the spies. Cheli ordered Paul killed because his affection for Barbara was beginning to limit his effectiveness, and she immediately suspects Mac is not what he seems.
　　Gabriel's wife Vera, the Lawrys' maid, is also a part of the plot. When Gabriel does not return home, Vera becomes hysterical with worry. Mac secretly asks Vera to meet him in the greenhouse, using her worry about Gabriel as a lure. She is observed by the others, however, and is killed by Hansen before she can reach Mac. The spies cut the house's telephone wires so that Mac and Norma cannot call the police, and Cheli has Mac locked up under guard. Using his blindness as a distraction, Mac overpowers his guard and releases Friday out a window with instructions to "go home and get Marty." Stephen arrives home and Cheli threatens his family if he does not give her the final step in creating his invention, which was not in the safe. Barbara finally realizes how much Norma actually cares for her. Mac tries to stall for time, but is locked in the cellar. When Hansen goes to kill him, Mac has broken the light bulb and his advantage of total darkness helps him overcome the spy. Marty and Friday return with the police. When Friday is spotted by a lookout, Mac overpowers him and is saved from being shot by another lookout by Friday. After the spies are captured, Stephen and Norma are off to Washington, D.C., with Barbara remaining behind to care for her new "Uncle Mac."

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       2.角色形象鲜明，深入人心。剧情,剧情片,悬疑,犯罪电影中的人物发展非常成功，每个人物都有自己独特的个性和形象。他们的行为和决定符合他们的性格，让观众能与他们感同身受，了解人物的内心世界。

       3.视觉效果出色，震撼人心。这部剧情,剧情片,悬疑,犯罪电影视觉效果极佳，画面细腻细致，无论是场景还是人物造型都令人印象深刻。特效制作也相当出色，能给人带来震撼的视觉体验。

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       5.演员们表演得很精彩，打动了人们的心。演员的表演非常出色，每个演员都深入发展了自己的性格。他们的表演真实自然，完全可以让观众沉浸在故事中，体验人物的喜怒哀乐。

       6.故事情节深刻，发人深思。剧情,剧情片,悬疑,犯罪电影的故事情节不仅引人入胜，而且具有深刻的内涵和意义。它反映了人类社会的一些重要问题，具有深刻的见解。观众也可以在享受故事的同时思考这些问题，对生活有更多的启发。

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       9.导演的手法很独特，很有艺术性。导演在这部电影中的手法非常独特，他运用了多种艺术手段来增强电影的艺术感。这些技巧包括独特的镜头使用，创新的剪辑方法和深刻的音乐设计。这些元素使这部电影成为一部极具艺术性的作品。

       10.寓意深刻，启人心智。剧情,剧情片,悬疑,犯罪电影这部电影通过情节和人物的呈现向观众传达了深刻的意义。这些暗示并不局限于肤浅的故事情节，而是深入到对人性和社会问题的探讨。他们可以激发观众思考他们与社会的关系，以及如何在他们的生活中做出有意义的选择。

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