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Mr. Wilson has a stock certificate worth $500 and hides it from Dennis by putting it in his phone book. Dennis switches Mr. Wilson's old book with the new edition while Mr. Wilson is bathing. The stock certificate falls out of the book, and Dennis retrieves it without knowing what it is. Mr. Wilson, later, finds out what happened with the books, so he and Henry go to search for the certificate they think is still inside the old phone book. Add a recap »