When a young man sees his fiancée struck and killed by a hit-and-run driver, he is inconsolable. When questioned by the police, he is unable to remember anything that he saw, even though he wants very much to have the driver caught. A week later, he is visited by a stranger who claims he can help. The visitor tells him that his own son died in the same way, and he offers to help the young man to remember the license plate number that he saw, by using special memory recall methods. It's not clear, though, what the visitor's motive for helping might be.
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[opens with Hitchcock taking things out of a trunk
Now, that's not it. I'm trying to locate a lost article. The only difficulty is, I can't remember what I lost.
[pulls out a noose
No, this isn't it. I don't know why I keep it. I don't think it's any good anymore, it's been used.
[pulls out a gun
This is for the man who has everything. It's to enable you to take some of it away from him. By the way, this may take all evening, so while I'm looking here, why don't you look over there.