There are only two types of suspense in suspense dramas. One is to never reveal the identity of the criminal, so that the audience will always remain suspicious of who the criminal is and what will happen;
The other is to let the audience know the existence of danger in advance, so that the audience is always sweating for the characters in the film, watching the criminals carry out the crimes step by step and how the victims finally escape the disaster.
From falling on the floor, being locked in a garage full of smoke, to the climax on the train at the end, after realizing that his niece knew something about his true identity, Charlie secretly murdered her several times. Li was just unhappy because she found out the truth, unaware that she was in danger.
This is Hitchcock's purpose, he makes the audience become the insider before the protagonist, so that he is trapped in nervous anticipation, and the audience has to be "tortured" by suspense throughout the development of the plot.
As Hitchcock once famously said: Knowing where the bomb is, but not knowing when it will explode, is a more restless suspense.
Without a doubt, Hitchcock did it!
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