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Walter discovered a book named "NUMER 23" and started reading it.
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Walter realized that the book told his childhood.
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Walter started obsessing with the number 23.
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He realized that the author of the book was a murderer and wanted to find out who he was
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His wife and son diceded to investigate with him
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They thought that the killer was a prisoner and wanted to talk to him.
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After talking to him, he knew he wasn't the killer
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They discovered the victim's body, someone took it away and he suspected his wife who was collecting evidence.
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The evidence that Agatha collected shows that the killer was Walter
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He gave himself up and after being in jail for a while, they gave him probation.