Hitchcock really is a genius! An uncomplicated murder case leads the audience all the way, creating a series of suspense and accidents. Except for hotels and cars, the filming location has hardly left the house, which shows the director's skill.
The ending of the film is different from the usual mystery: the mastermind of the murder is not brought to justice. The prosecutor's approach is somewhat suspicious of fishing and law enforcement, and at most it can prove that the female protagonist is not murder, but it cannot prove that the male protagonist designed the murder. Therefore, under this arrangement, it can be shown that the version given by the male writer is possible, but there is no substantial evidence to prove that the male protagonist did that - the killer is dead, and there is no proof. Hitchcock's intention is to make the audience think rationally about the issue of loyalty to marriage. If the heroine is executed or the hero is imprisoned, the audience's views on the issue of cheating will become extreme. Betrayal of marriage will pay a high price, but cheating does not kill, and punishing cheaters should not go to hell.
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