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According to Tom, Wilson's plan didn't work because the knife in question doesn't exist.
I think so," said Tom. "There can't be any doubt of it. Have you ever seen that knife?"
"Has any friend of yours?"
"Not that I know of."
"Well, I begin to think I understand why your scheme failed."
"What do you mean, Tom? What are you driving at?" asked Wilson, with a dawning sense of discomfort.
"Why, that there isn't any such knife."