One of Hitchcock's classic suspense films, it is necessary to sort out the main plot:
The first is the murder of the wife planned by the husband and college friends at the beginning. Behind the seemingly seamless plan, the plan always fails to keep up with the changes. In the end, the killer was counter-killed instead, and Plan A failed. I have to say that the male protagonist has a high IQ and immediately reacted and implemented Plan B: Killing with a knife. The specific operation:
1. Take out the key from the deceased and put it back in the wife's small leather bag. This key is the key to solving the case.
2. The stockings that were originally prepared for the murder weapon were burned and replaced with two stockings in the wife's bag, one outside the door and the other at the bottom of the table.
3. Put the letter written by the third man to his wife on the body of the deceased.
Deliberately revealing the news of the derailment of the wife to the police, the police will naturally start from the letter to investigate the relationship between the deceased and his wife. Then the husband automatically revealed the information to the police, which is easily reminiscent of the motive for the murder. So the wife naturally became the number one suspect in the case.
However, despite all the calculations, the male protagonist still made a mistake, and finally let the police target him:
The most crucial key: the key from the deceased was secretly taken back by the husband. He thought it was his wife's key, but he never thought that it was actually the deceased's own. The wife's key was hidden under a blanket on the stairs long after the deceased entered the house. So when the detective took that key to the deceased's house and was surprised to find that he could open his door, it became suspicious. If it was the wife who opened the door and let him in, why was the key of the deceased in the bag?
So the detective took the opportunity to steal the original murderer's key and the husband's key from his bag. After the husband went out, he used his key to enter his house, while the wife's key was always under the stair mat. Just to confirm one point:
If his guess is wrong, that the husband is innocent, then it is impossible to know that there is a key under the mat, and if the door cannot be opened, he will leave immediately.
If the husband is really what he expected, then after finding out that the key is wrong, he will definitely realize the existence of the key under the stair mat and use it to open the door. Once the door is opened, it is time to throw himself in the trap.
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