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From The Perry Mason TV Show Book (Revised)
An attention-starved girl innocently leaks vital information about her father's business, Gregson Cannery Company, in letters to her pen pal. When the information gets into the wrong hands, the company's financial security is seriously threatened. Great Aunt Wilma, the head of the company, takes it upon herself to punish little Sandra severely for leaking the information.
Later, when Aunt Wilma is murdered, Sandra must testify privately in the judge's chambers. This little girl knows more than she wants to.