《公民凯恩》是由奥逊·威尔斯执导，奥逊·威尔斯,约瑟夫·科顿,多萝西·康明戈尔,阿格妮丝·摩尔海德主演的剧情片。该电影于1941年在美国上映。美国报业大亨凯恩（奥森•韦尔斯）在桑拿都庄园中留下“玫瑰花蕾”的“遗言”死去后，一位青年记者受媒体的委托调查这四个字的含义，遂即，他走访了凯恩生前的同事好友，从报社董事长伯恩斯坦的口中，了解到凯恩的发迹历程以及如何制造舆论使美国卷入1897年的战争中的往事，从利兰的讲述中，凯恩与美国总统的侄女爱米丽的婚姻、与第二任妻子（歌手）苏珊的复杂关系及在总统竞选中的失败等等也被他一一所知。听过大量的讲述后，该记者又去图书馆查阅了有关凯恩的详尽资料，凯恩更多的一面，青年时代的经历及与母亲的关系也被他知晓，然而，“玫瑰花蕾”四字的含义，他仍不得而知。
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