In terms of plot, "Shadow of a Doubt" is not Hitchcock's masterpiece, but it succeeds because it creates suspense. Before the niece was killed or proved to be right, how close she was to the truth, all the elements were effectively meshed together during the operation of the film. Then the weakness will become apparent
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"Shadow of a Doubt" ends with a seemingly happy ending, but the ending can be happier. The film is not meant to express whether there is a middle ground here. The process of finding the truth makes the heroine more wiser, cherish the life she enjoys more, but fear the world more than ever. Just like everything else in the movie, even happiness carries shadows
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